diff --git a/packages/mongo/collection.js b/packages/mongo/collection.js
index 6459e3e5f4..fa21ae0f76 100644
--- a/packages/mongo/collection.js
+++ b/packages/mongo/collection.js
@@ -339,7 +339,6 @@ Object.assign(Mongo.Collection.prototype, {
    * @method estimatedDocumentCount
    * @memberof Mongo.Collection
    * @instance
-   * @param {MongoSelector} [selector] A query describing the documents to count
    * @param {Object} [options] All options are listed in [MongoDB documentation](https://mongodb.github.io/node-mongodb-native/4.11/interfaces/EstimatedDocumentCountOptions.html). Please note that not all of them are available on the client.
    * @returns {Promise<number>}
    */
diff --git a/packages/mongo/mongo.d.ts b/packages/mongo/mongo.d.ts
index 894b5bfc13..ab1697aac0 100644
--- a/packages/mongo/mongo.d.ts
+++ b/packages/mongo/mongo.d.ts
@@ -171,6 +171,17 @@ export namespace Mongo {
       selector?: Selector<T> | ObjectID | string,
       options?: O
     ): Promise<DispatchTransform<O['transform'], T, U> | undefined>;
+    /**
+     * Gets the number of documents matching the filter. For a fast count of the total documents in a collection see `estimatedDocumentCount`.
+     * @param selector The query for filtering the set of documents to count
+     * @param options All options are listed in [MongoDB documentation](https://mongodb.github.io/node-mongodb-native/4.11/interfaces/CountDocumentsOptions.html). Please note that not all of them are available on the client.
+     */
+    countDocuments(selector?: Selector<T> | ObjectID | string, options?: MongoNpmModule.CountDocumentsOptions): Promise<number>;
+    /**
+     * Gets an estimate of the count of documents in a collection using collection metadata. For an exact count of the documents in a collection see `countDocuments`.
+     * @param options All options are listed in [MongoDB documentation](https://mongodb.github.io/node-mongodb-native/4.11/interfaces/CountDocumentsOptions.html). Please note that not all of them are available on the client.
+     */
+    estimatedDocumentCount(options?: MongoNpmModule.EstimatedDocumentCountOptions): Promise<number>;
     /**
      * Insert a document in the collection.  Returns its unique _id.
      * @param doc The document to insert. May not yet have an _id attribute, in which case Meteor will generate one for you.