diff --git a/docs/Supported-File-Managers.md b/docs/Supported-File-Managers.md
index 1a67502..3574d34 100644
--- a/docs/Supported-File-Managers.md
+++ b/docs/Supported-File-Managers.md
@@ -154,4 +154,4 @@ export default defineConfig({
 });
 ```
 
-> [See `IFileManager` interface to see the required methods and properties for a custom file manager.](../src/files/file-manager.ts)
+> [See `IFileManager` interface to see the required methods and properties for a custom file manager.](../src/services/file-manager.ts)
diff --git a/examples/custom-file-manager/README.md b/examples/custom-file-manager/README.md
index 2b36f02..26893fe 100644
--- a/examples/custom-file-manager/README.md
+++ b/examples/custom-file-manager/README.md
@@ -26,4 +26,4 @@ You can define a custom file manager either by implementing the `IFileManager` i
 - [custom-file-manager-function.ts](./custom-file-manager-function.ts) - defines a custom file manager using the `defineFileManager` function.
 
 > [!NOTE]
-> Have a look at the [files folder](../../src/files) within the fork-version source code for example on how to work with different file types.
+> Have a look at the [file-managers folder](../../src/file-managers) within the fork-version source code for example on how to work with different file types.
diff --git a/src/cli.ts b/src/cli.ts
index 2bf1cc9..e388e0b 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -7,7 +7,7 @@ import { ZodError } from "zod";
 import { getCliArguments } from "./config/cli-arguments";
 import { getUserConfig } from "./config/user-config";
 import { Logger } from "./services/logger";
-import { FileManager } from "./files/file-manager";
+import { FileManager } from "./services/file-manager";
 import { Git } from "./services/git";
 
 import { validateConfig } from "./commands/validate-config";
diff --git a/src/commands/__tests__/inspect.test.ts b/src/commands/__tests__/inspect.test.ts
index 9015054..ec37d7b 100644
--- a/src/commands/__tests__/inspect.test.ts
+++ b/src/commands/__tests__/inspect.test.ts
@@ -1,5 +1,5 @@
 import { setupTest } from "../../../tests/setup-tests";
-import { FileManager } from "../../files/file-manager";
+import { FileManager } from "../../services/file-manager";
 import { inspect } from "../inspect";
 
 describe("inspect", () => {
diff --git a/src/commands/inspect.ts b/src/commands/inspect.ts
index 0fc9a05..c100552 100644
--- a/src/commands/inspect.ts
+++ b/src/commands/inspect.ts
@@ -4,7 +4,7 @@ import { getCurrentVersion } from "../process/get-current-version";
 
 import type { ForkConfig } from "../config/types";
 import type { Logger } from "../services/logger";
-import type { FileManager } from "../files/file-manager";
+import type { FileManager } from "../services/file-manager";
 import type { Git } from "../services/git";
 
 export async function inspect(
diff --git a/src/commands/main.ts b/src/commands/main.ts
index d9d9863..d07a3ba 100644
--- a/src/commands/main.ts
+++ b/src/commands/main.ts
@@ -7,7 +7,7 @@ import { tagChanges } from "../process/tag";
 
 import type { ForkConfig } from "../config/types";
 import type { Logger } from "../services/logger";
-import type { FileManager } from "../files/file-manager";
+import type { FileManager } from "../services/file-manager";
 import type { Git } from "../services/git";
 
 export async function main(config: ForkConfig, logger: Logger, fileManager: FileManager, git: Git) {
diff --git a/src/config/__tests__/define-file-manager.test.ts b/src/config/__tests__/define-file-manager.test.ts
new file mode 100644
index 0000000..9a4fef7
--- /dev/null
+++ b/src/config/__tests__/define-file-manager.test.ts
@@ -0,0 +1,23 @@
+import { defineFileManager } from "../define-file-manager";
+import type { IFileManager } from "../../services/file-manager";
+
+describe("define-file-manager", () => {
+	it("should return the given file manager", () => {
+		const TEST_FILE_MANAGER: IFileManager = {
+			read: async (filePath) => {
+				return {
+					path: filePath,
+					version: "1.2.3",
+				};
+			},
+			write: async (_fileState, _newVersion) => {
+				// no-op
+			},
+			isSupportedFile: (filePath) => {
+				return filePath.endsWith(".test");
+			},
+		};
+
+		expect(defineFileManager(TEST_FILE_MANAGER)).toStrictEqual(TEST_FILE_MANAGER);
+	});
+});
diff --git a/src/config/define-config.ts b/src/config/define-config.ts
index 562a483..514d750 100644
--- a/src/config/define-config.ts
+++ b/src/config/define-config.ts
@@ -1,7 +1,22 @@
 import type { Config } from "./types";
 
 /**
- * [Fork-Version - Config Properties](https://github.com/eglavin/fork-version/blob/main/README.md#config-properties)
+ * Optional helper function to enable intellisense and type checking when defining a Fork-Version configuration object.
+ *
+ * [Fork-Version - Config Options](https://github.com/eglavin/fork-version/blob/main/docs/Configuration.md#config-options)
+ *
+ * @example
+ * ```ts
+ * // File: fork.config.ts
+ * import { defineConfig } from "fork-version";
+ *
+ * export default defineConfig({
+ *   header: "# Changelog\n\nMy Custom Changelog Header",
+ * });
+ * ```
+ *
+ * @param config The configuration object to be defined.
+ * @returns The same configuration object that was passed in.
  */
 export function defineConfig(config: Config): Config {
 	return config;
diff --git a/src/config/define-file-manager.ts b/src/config/define-file-manager.ts
new file mode 100644
index 0000000..24eef11
--- /dev/null
+++ b/src/config/define-file-manager.ts
@@ -0,0 +1,41 @@
+import type { IFileManager } from "../services/file-manager";
+
+/**
+ * Optional helper function to enable intellisense and type checking when defining a custom file manager.
+ *
+ * [Fork-Version - Custom File Managers](https://github.com/eglavin/fork-version/blob/main/docs/Supported-File-Managers.md#custom-file-updaters)
+ *
+ *
+ * @example
+ * ```ts
+ * // File: fork.config.ts
+ * import { defineFileManager } from "fork-version";
+ *
+ * const myFileManager = defineFileManager({
+ *   async read(filePath) {
+ *     // Logic to read the file and extract the version.
+ *     return {
+ *       path: "/path/to/file",
+ *       version: "1.2.3",
+ *     };
+ *   },
+ *   async write(fileState, newVersion) {
+ *     // Logic to write the updated version.
+ *   },
+ *   isSupportedFile(fileName) {
+ *     // Logic to determine if the file is supported by this file manager.
+ *     return fileName.endsWith(".custom");
+ *   },
+ * });
+ *
+ * export default {
+ *   customFileManagers: [myFileManager],
+ * }
+ * ```
+ *
+ * @param fileManager The custom file manager to be defined.
+ * @returns The same file manager object that was passed in.
+ */
+export function defineFileManager(fileManager: IFileManager): IFileManager {
+	return fileManager;
+}
diff --git a/src/config/types.ts b/src/config/types.ts
index 7173175..9c46eba 100644
--- a/src/config/types.ts
+++ b/src/config/types.ts
@@ -1,6 +1,6 @@
 import type { getCliArguments } from "./cli-arguments";
 import type { ParserOptions } from "../commit-parser/options";
-import type { IFileManager } from "../files/file-manager";
+import type { IFileManager } from "../services/file-manager";
 
 export interface ChangelogPresetConfigType {
 	/**
diff --git a/src/files/__tests__/arm-bicep.test.ts b/src/file-managers/__tests__/arm-bicep.test.ts
similarity index 98%
rename from src/files/__tests__/arm-bicep.test.ts
rename to src/file-managers/__tests__/arm-bicep.test.ts
index 3c77289..ab9119e 100644
--- a/src/files/__tests__/arm-bicep.test.ts
+++ b/src/file-managers/__tests__/arm-bicep.test.ts
@@ -1,7 +1,7 @@
 import { readFileSync } from "node:fs";
 
 import { setupTest } from "../../../tests/setup-tests";
-import { MissingPropertyException } from "../file-manager";
+import { MissingPropertyException } from "../../services/file-manager";
 import { ARMBicep } from "../arm-bicep";
 
 describe("files arm-bicep", () => {
diff --git a/src/files/__tests__/install-shield-ism.test.ts b/src/file-managers/__tests__/install-shield-ism.test.ts
similarity index 97%
rename from src/files/__tests__/install-shield-ism.test.ts
rename to src/file-managers/__tests__/install-shield-ism.test.ts
index 1692136..f12749a 100644
--- a/src/files/__tests__/install-shield-ism.test.ts
+++ b/src/file-managers/__tests__/install-shield-ism.test.ts
@@ -1,5 +1,5 @@
 import { setupTest } from "../../../tests/setup-tests";
-import { MissingPropertyException } from "../file-manager";
+import { MissingPropertyException } from "../../services/file-manager";
 import { InstallShieldISM } from "../install-shield-ism";
 
 describe("files install-shield-ism", () => {
diff --git a/src/files/__tests__/json-package.test.ts b/src/file-managers/__tests__/json-package.test.ts
similarity index 98%
rename from src/files/__tests__/json-package.test.ts
rename to src/file-managers/__tests__/json-package.test.ts
index c84a3ea..eb57283 100644
--- a/src/files/__tests__/json-package.test.ts
+++ b/src/file-managers/__tests__/json-package.test.ts
@@ -1,7 +1,7 @@
 import { readFileSync } from "node:fs";
 
 import { setupTest } from "../../../tests/setup-tests";
-import { MissingPropertyException } from "../file-manager";
+import { MissingPropertyException } from "../../services/file-manager";
 import { JSONPackage } from "../json-package";
 
 describe("files json-package", () => {
diff --git a/src/files/__tests__/ms-build-project.test.ts b/src/file-managers/__tests__/ms-build-project.test.ts
similarity index 98%
rename from src/files/__tests__/ms-build-project.test.ts
rename to src/file-managers/__tests__/ms-build-project.test.ts
index ff3bc6c..15231a2 100644
--- a/src/files/__tests__/ms-build-project.test.ts
+++ b/src/file-managers/__tests__/ms-build-project.test.ts
@@ -1,7 +1,7 @@
 import { readFileSync } from "node:fs";
 
 import { setupTest } from "../../../tests/setup-tests";
-import { MissingPropertyException } from "../file-manager";
+import { MissingPropertyException } from "../../services/file-manager";
 import { MSBuildProject } from "../ms-build-project";
 
 describe("files ms-build-project", () => {
diff --git a/src/files/__tests__/plain-text.test.ts b/src/file-managers/__tests__/plain-text.test.ts
similarity index 95%
rename from src/files/__tests__/plain-text.test.ts
rename to src/file-managers/__tests__/plain-text.test.ts
index 179ffd1..99f09eb 100644
--- a/src/files/__tests__/plain-text.test.ts
+++ b/src/file-managers/__tests__/plain-text.test.ts
@@ -1,7 +1,7 @@
 import { readFileSync } from "node:fs";
 
 import { setupTest } from "../../../tests/setup-tests";
-import { MissingPropertyException } from "../file-manager";
+import { MissingPropertyException } from "../../services/file-manager";
 import { PlainText } from "../plain-text";
 
 describe("files plain-text", () => {
diff --git a/src/files/__tests__/yaml-package.test.ts b/src/file-managers/__tests__/yaml-package.test.ts
similarity index 97%
rename from src/files/__tests__/yaml-package.test.ts
rename to src/file-managers/__tests__/yaml-package.test.ts
index b07570f..3796875 100644
--- a/src/files/__tests__/yaml-package.test.ts
+++ b/src/file-managers/__tests__/yaml-package.test.ts
@@ -1,5 +1,5 @@
 import { setupTest } from "../../../tests/setup-tests";
-import { MissingPropertyException } from "../file-manager";
+import { MissingPropertyException } from "../../services/file-manager";
 import { YAMLPackage } from "../yaml-package";
 
 describe("files yaml-package", () => {
diff --git a/src/files/arm-bicep.ts b/src/file-managers/arm-bicep.ts
similarity index 92%
rename from src/files/arm-bicep.ts
rename to src/file-managers/arm-bicep.ts
index 1baa1ff..5e6f6f9 100644
--- a/src/files/arm-bicep.ts
+++ b/src/file-managers/arm-bicep.ts
@@ -1,6 +1,10 @@
 import { readFile, writeFile } from "node:fs/promises";
 
-import { MissingPropertyException, type FileState, type IFileManager } from "./file-manager";
+import {
+	MissingPropertyException,
+	type FileState,
+	type IFileManager,
+} from "../services/file-manager";
 
 /**
  * An ARM bicep file with metadata and variable called contentVersion.
diff --git a/src/files/install-shield-ism.ts b/src/file-managers/install-shield-ism.ts
similarity index 94%
rename from src/files/install-shield-ism.ts
rename to src/file-managers/install-shield-ism.ts
index 0cf1d2a..9c6aada 100644
--- a/src/files/install-shield-ism.ts
+++ b/src/file-managers/install-shield-ism.ts
@@ -1,7 +1,11 @@
 import { readFile, writeFile } from "node:fs/promises";
 import * as cheerio from "cheerio/slim";
 
-import { MissingPropertyException, type FileState, type IFileManager } from "./file-manager";
+import {
+	MissingPropertyException,
+	type FileState,
+	type IFileManager,
+} from "../services/file-manager";
 
 /**
  * An InstallShield ISM file can be either XML or binary, only the XML format is supported
diff --git a/src/files/json-package.ts b/src/file-managers/json-package.ts
similarity index 96%
rename from src/files/json-package.ts
rename to src/file-managers/json-package.ts
index ebfbcad..8c27ad8 100644
--- a/src/files/json-package.ts
+++ b/src/file-managers/json-package.ts
@@ -8,7 +8,11 @@ import {
 	type ParseOptions,
 } from "jsonc-parser";
 
-import { MissingPropertyException, type FileState, type IFileManager } from "./file-manager";
+import {
+	MissingPropertyException,
+	type FileState,
+	type IFileManager,
+} from "../services/file-manager";
 
 /** The things we are interested in, in package.json-like files. */
 interface PackageJsonish {
diff --git a/src/files/ms-build-project.ts b/src/file-managers/ms-build-project.ts
similarity index 94%
rename from src/files/ms-build-project.ts
rename to src/file-managers/ms-build-project.ts
index 18c0134..a59fd2a 100644
--- a/src/files/ms-build-project.ts
+++ b/src/file-managers/ms-build-project.ts
@@ -1,7 +1,11 @@
 import { readFile, writeFile } from "node:fs/promises";
 import * as cheerio from "cheerio/slim";
 
-import { MissingPropertyException, type FileState, type IFileManager } from "./file-manager";
+import {
+	MissingPropertyException,
+	type FileState,
+	type IFileManager,
+} from "../services/file-manager";
 
 /**
  * A ms-build file is an xml file with a version property under the Project > PropertyGroup node.
diff --git a/src/files/plain-text.ts b/src/file-managers/plain-text.ts
similarity index 87%
rename from src/files/plain-text.ts
rename to src/file-managers/plain-text.ts
index fc1ecd1..1fc6967 100644
--- a/src/files/plain-text.ts
+++ b/src/file-managers/plain-text.ts
@@ -1,6 +1,10 @@
 import { readFile, writeFile } from "node:fs/promises";
 
-import { MissingPropertyException, type FileState, type IFileManager } from "./file-manager";
+import {
+	MissingPropertyException,
+	type FileState,
+	type IFileManager,
+} from "../services/file-manager";
 
 /**
  * A plain text file will have just the version as the content.
diff --git a/src/files/yaml-package.ts b/src/file-managers/yaml-package.ts
similarity index 92%
rename from src/files/yaml-package.ts
rename to src/file-managers/yaml-package.ts
index 5d23ab5..410c9f9 100644
--- a/src/files/yaml-package.ts
+++ b/src/file-managers/yaml-package.ts
@@ -1,7 +1,11 @@
 import { readFile, writeFile } from "node:fs/promises";
 import { parse, parseDocument } from "yaml";
 
-import { MissingPropertyException, type FileState, type IFileManager } from "./file-manager";
+import {
+	MissingPropertyException,
+	type FileState,
+	type IFileManager,
+} from "../services/file-manager";
 
 /**
  * A yaml package file should have a version property on the top level, like what can be seen
diff --git a/src/index.ts b/src/index.ts
index 23ef61b..adf301c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -21,6 +21,7 @@ export type {
 	Config,
 } from "./config/types";
 export { defineConfig } from "./config/define-config";
+export { defineFileManager } from "./config/define-file-manager";
 export { getUserConfig } from "./config/user-config";
 
 export { getCommitsSinceTag, type CommitsSinceTag } from "./process/get-commits";
@@ -31,12 +32,10 @@ export { commitChanges } from "./process/commit";
 export { tagChanges } from "./process/tag";
 
 export {
-	defineFileManager,
 	FileManager,
 	MissingPropertyException,
 	type FileState,
 	type IFileManager,
-} from "./files/file-manager";
-
+} from "./services/file-manager";
 export { Logger } from "./services/logger";
 export { Git } from "./services/git";
diff --git a/src/process/__tests__/get-current-version.test.ts b/src/process/__tests__/get-current-version.test.ts
index 92b4ad6..b0be909 100644
--- a/src/process/__tests__/get-current-version.test.ts
+++ b/src/process/__tests__/get-current-version.test.ts
@@ -1,7 +1,7 @@
 import { setupTest } from "../../../tests/setup-tests";
 import { getCommitsSinceTag } from "../get-commits";
 import { getCurrentVersion } from "../get-current-version";
-import { FileManager } from "../../files/file-manager";
+import { FileManager } from "../../services/file-manager";
 
 describe("getCurrentVersion", () => {
 	it("should be able to read package.json", async () => {
diff --git a/src/process/commit.ts b/src/process/commit.ts
index 08140a6..1813845 100644
--- a/src/process/commit.ts
+++ b/src/process/commit.ts
@@ -2,7 +2,7 @@ import { resolve } from "node:path";
 import { formatCommitMessage } from "../utils/format-commit-message";
 import { fileExists } from "../utils/file-state";
 import type { ForkConfig } from "../config/types";
-import type { FileState } from "../files/file-manager";
+import type { FileState } from "../services/file-manager";
 import type { Logger } from "../services/logger";
 import type { Git } from "../services/git";
 
diff --git a/src/process/get-current-version.ts b/src/process/get-current-version.ts
index 0de137d..6bb254a 100644
--- a/src/process/get-current-version.ts
+++ b/src/process/get-current-version.ts
@@ -1,7 +1,7 @@
 import semver from "semver";
 
 import type { ForkConfig } from "../config/types";
-import type { FileManager, FileState } from "../files/file-manager";
+import type { FileManager, FileState } from "../services/file-manager";
 import type { Logger } from "../services/logger";
 import type { Git } from "../services/git";
 
diff --git a/src/files/__tests__/file-manager.test.ts b/src/services/__tests__/file-manager.test.ts
similarity index 99%
rename from src/files/__tests__/file-manager.test.ts
rename to src/services/__tests__/file-manager.test.ts
index 45b154b..aea7084 100644
--- a/src/files/__tests__/file-manager.test.ts
+++ b/src/services/__tests__/file-manager.test.ts
@@ -5,12 +5,12 @@ import { readFileSync } from "node:fs";
 
 import { setupTest } from "../../../tests/setup-tests";
 import {
-	defineFileManager,
 	FileManager,
 	MissingPropertyException,
 	type FileState,
 	type IFileManager,
-} from "../file-manager";
+} from "../../services/file-manager";
+import { defineFileManager } from "../../config/define-file-manager";
 
 describe("files file-manager", () => {
 	describe("json file", () => {
diff --git a/src/files/file-manager.ts b/src/services/file-manager.ts
similarity index 90%
rename from src/files/file-manager.ts
rename to src/services/file-manager.ts
index 0aa1986..3f42bbb 100644
--- a/src/files/file-manager.ts
+++ b/src/services/file-manager.ts
@@ -1,16 +1,16 @@
 import { isAbsolute, relative, resolve } from "node:path";
 
 import { fileExists } from "../utils/file-state";
-import { JSONPackage } from "./json-package";
-import { YAMLPackage } from "./yaml-package";
-import { PlainText } from "./plain-text";
-import { MSBuildProject } from "./ms-build-project";
-import { ARMBicep } from "./arm-bicep";
-import { InstallShieldISM } from "./install-shield-ism";
+import { JSONPackage } from "../file-managers/json-package";
+import { YAMLPackage } from "../file-managers/yaml-package";
+import { PlainText } from "../file-managers/plain-text";
+import { MSBuildProject } from "../file-managers/ms-build-project";
+import { ARMBicep } from "../file-managers/arm-bicep";
+import { InstallShieldISM } from "../file-managers/install-shield-ism";
 
 import { extractBuildMetadata } from "../utils/extract-build-metadata";
 import type { ForkConfig } from "../config/types";
-import type { Logger } from "../services/logger";
+import type { Logger } from "./logger";
 
 /**
  * Exception thrown if a file manager encounters a file missing a required property,
@@ -79,15 +79,6 @@ export interface IFileManager {
 	isSupportedFile(filePath: string): boolean;
 }
 
-/**
- * Helper function to define a custom file manager with proper typing.
- *
- * [Fork-Version - Custom File Managers](https://github.com/eglavin/fork-version#custom-file-updaters)
- */
-export function defineFileManager(fileManager: IFileManager): IFileManager {
-	return fileManager;
-}
-
 export class FileManager {
 	#config: ForkConfig;
 	#logger: Logger;