diff --git a/.github/workflows/codespell.yml b/.github/workflows/codespell.yml
new file mode 100644
index 0000000..23503af
--- /dev/null
+++ b/.github/workflows/codespell.yml
@@ -0,0 +1,16 @@
+# GitHub Action to automate the identification of common misspellings in text files.
+# https://github.com/codespell-project/actions-codespell
+# https://github.com/codespell-project/codespell
+name: codespell
+on: [push, pull_request]
+jobs:
+  codespell:
+    name: Check for spelling errors
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: codespell-project/actions-codespell@master
+        with:
+          check_filenames: true
+          check_hidden: true
+          skip: ./.git,./amd-test/require.js
diff --git a/README.md b/README.md
index 40228b7..384243a 100644
--- a/README.md
+++ b/README.md
@@ -103,7 +103,7 @@ require('source-map-support').install({
 ```
 
 The module will by default assume a browser environment if XMLHttpRequest and window are defined. If either of these do not exist it will instead assume a node environment.
-In some rare cases, e.g. when running a browser emulation and where both variables are also set, you can explictly specify the environment to be either 'browser' or 'node'.
+In some rare cases, e.g. when running a browser emulation and where both variables are also set, you can explicitly specify the environment to be either 'browser' or 'node'.
 
 ```js
 require('source-map-support').install({
diff --git a/source-map-support.js b/source-map-support.js
index 4459386..4ad6b1b 100644
--- a/source-map-support.js
+++ b/source-map-support.js
@@ -192,7 +192,7 @@ retrieveMapHandlers.push(function(source) {
 function mapSourcePosition(position) {
   var sourceMap = sourceMapCache[position.source];
   if (!sourceMap) {
-    // Call the (overrideable) retrieveSourceMap function to get the source map.
+    // Call the (overridable) retrieveSourceMap function to get the source map.
     var urlAndMap = retrieveSourceMap(position.source);
     if (urlAndMap) {
       sourceMap = sourceMapCache[position.source] = {
@@ -306,7 +306,7 @@ function CallSiteToString() {
   var isMethodCall = !(this.isToplevel() || isConstructor);
   if (isMethodCall) {
     var typeName = this.getTypeName();
-    // Fixes shim to be backward compatable with Node v0 to v4
+    // Fixes shim to be backward compatible with Node v0 to v4
     if (typeName === "[object Object]") {
       typeName = "null";
     }