diff --git a/types/multiplexjs/index.d.ts b/types/multiplexjs/index.d.ts
index eddd801609..0cc38c8c06 100644
--- a/types/multiplexjs/index.d.ts
+++ b/types/multiplexjs/index.d.ts
@@ -448,9 +448,9 @@ declare namespace multiplex {
 
         /**
         * Performs the specified action on each element of the List.
-        * @param action The action function to perform on each element of the List.
+        * @param action The action function to perform on each element of an List; the second parameter of the function represents the index of the source element.
         */
-        forEach(action: (item: T) => void): void
+        forEach(action: (item: T, index: number) => void): void
 
 
         /**
@@ -1741,14 +1741,6 @@ declare namespace multiplex {
         */
         firstOrDefault(predicate: (item: T) => boolean, defaultValue: T): T
 
-
-        /**
-        * Performs the specified action on each element of an Enumerable.
-        * @param action The action function to perform on each element of an Enumerable.
-        */
-        forEach(action: (item: T) => void): void
-
-
         /**
         * Performs the specified action on each element of an Enumerable.
         * @param action The action function to perform on each element of an Enumerable; the second parameter of the function represents the index of the source element.