diff --git a/README.md b/README.md
index 35880fc..b586fbc 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@ Required if collection hasn't been set.
 * **expireTimeMs**: integer -- time period, in milliseconds, after which record will be reset (deleted).
 Defaults to `60 * 1000`. Notice that current implementation uses on mongodb ttl indexes - background task that removes expired documents runs every 60 seconds. As a result, documents may remain in a collection during the period between the expiration of the document and the running of the background task. See [mongodb ttl indexes doc](https://docs.mongodb.com/v3.6/core/index-ttl/#timing-of-the-delete-operation) for more information.
 
-Note: unless express-tate-limit's headers are disabled, `windowMs` on express-tate-limit's options should be set to the same value as `expireTimeMs` on rate-limit-mongo's options in order for the `Retry-After` header to be correct.
+Note: unless express-rate-limit's headers are disabled, `windowMs` on express-rate-limit's options should be set to the same value as `expireTimeMs` on rate-limit-mongo's options in order for the `Retry-After` header to be correct.
 
 * **resetExpireDateOnChange**: boolean -- indicates whether expireDate should be reset when changed or not.
 Defaults to `false`.
@@ -84,7 +84,7 @@ required by [express-rate-limit](https://github.com/nfriedly/express-rate-limit)
 In addition following methods provided:
 
 * `getClient(callback)` - if `collection` was not passed to the constructor then
-that method will pass (as second argument) initiated instace of
+that method will pass (as second argument) initiated instance of
 [MongoClient](http://mongodb.github.io/node-mongodb-native/3.3/api/MongoClient.html)
 to the `callback`, otherwise `null` will be passed. Thus this method provides
 control over connection initiated by the library to the end user. This method
diff --git a/lib/index.d.ts b/lib/index.d.ts
new file mode 100644
index 0000000..3447374
--- /dev/null
+++ b/lib/index.d.ts
@@ -0,0 +1,118 @@
+import { MongoClient, MongoClientOptions, Collection } from 'mongodb';
+
+declare module 'rate-limit-mongo' {
+
+    export default class MongoStore {
+
+        constructor(options: Partial<MongoStoreOptions>);
+
+        /**
+         * Increments the value in the underlying store for the given key.
+         * @param key The key to use as the unique identifier passed down from RateLimit.
+         * @param cb he callback issued when the underlying  store is finished.
+         * 
+         * The callback should be called with three values:
+         *  - `error` (usually null)
+         *  - `hitCount` for this IP
+         *  - `resetTime` - JS Date object (optional, but necessary for X-RateLimit-Reset header)
+         */
+        incr(key: string, cb: (error: any, hitCount: number, resetTime: Date) => void): void;
+
+        /**
+         * Decrements the value in the underlying store for the given key. Used only when skipFailedRequests is true
+         * @param key The key to use as the unique identifier passed down from RateLimit.
+         */
+        decrement(key: string): void;
+
+        /**
+         * Resets a value with the given key.
+         * @param key The key to reset.
+         */
+        resetKey(key: string): void;
+        
+        /**
+         * Resets every value
+         */
+        resetAll(): void;
+
+        /**
+         * if `collection` was not passed to the constructor then that method will pass (as second argument) initiated instance of
+        *  [MongoClient](http://mongodb.github.io/node-mongodb-native/3.3/api/MongoClient.html)
+         * to the `callback`, otherwise `null` will be passed. 
+         * Thus this method provides control over connection initiated by the library to the end user.
+         * This method is promisified (when `util.promisify` is presented (node.js >= 8)).
+         * @param callback 
+         */
+        getClient(callback: (collection: null, client: MongoClient | null) => any): void;
+
+    }
+
+    export interface MongoStoreOptions {
+
+        /**
+         * uri for connecting to mongodb, `mongodb://127.0.0.1:27017/test_db` for example. Required if collection hasn't been set.
+         */
+        uri: string;
+
+        /**
+         * name of collection for storing records. Defaults to `expressRateRecords`
+         */
+        collectionName: string;
+
+        /**
+         * username for authentication in mongodb
+         */
+        user: string;
+
+        /**
+         * password for authentication in mongodb
+         */
+        password: string;
+
+        /**
+         * db name against which authenticate use. If not set db name from uri will be taken.
+         */
+        authSource: string;
+
+        /**
+         * mongodb collection instance. Required if uri hasn't been set.
+         */
+        collection: Collection;
+
+        /**
+         * mongodb connection options. Allows to pass additional connection options to mongodb.
+         * The default connection options are `useUnifiedTopology: true`, `useNewUrlParser: true`.
+         */
+        connectionOptions: MongoClientOptions;
+
+        /**
+         * time period, in milliseconds, after which record will be reset (deleted). 
+         * Defaults to `60 * 1000`. 
+         * Notice that current implementation uses on mongodb ttl indexes - background task that removes expired documents runs every 60 seconds. 
+         * As a result, documents may remain in a collection during the period between the expiration of the document and the running of the background task.
+         * See [mongodb ttl indexes doc](https://docs.mongodb.com/v3.6/core/index-ttl/#timing-of-the-delete-operation) for more information.
+         */
+        expireTimeMs: number;
+
+        /**
+         * indicates whether expireDate should be reset when changed or not.
+         * Defaults to `false`.
+         */
+        resetExpireDateOnChange: boolean;
+
+        /**
+         * function that will be called if error happened during incr, decrement or resetKey methods. Defaults to `_.noop`.
+         */
+        errorHandler: (err: any) => any;
+
+        /**
+         * defines whether create ttl index (on `expirationDate` field with `expireAfterSeconds: 0`) on collection or not. 
+         * Could be useful in situations when you don't want to create index from the app e.g.
+         * due to restricted db permissions (see [#15](https://github.com/2do2go/rate-limit-mongo/issues/15) for details). 
+         * Defaults to `true`.
+         */
+        createTtlIndex: boolean;
+
+    }
+
+}
diff --git a/package.json b/package.json
index 4c6cffa..249f462 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,7 @@
   "author": "2do2go team <dev.2do2go@gmail.com>",
   "license": "MIT",
   "main": "lib/index.js",
+  "types": "lib/index.d.ts",
   "repository": {
     "type": "git",
     "url": "git@github.com:2do2go/rate-limit-mongo.git"