diff --git a/types/webpack/index.d.ts b/types/webpack/index.d.ts
index 8d4c7282ca..cc686b93b0 100644
--- a/types/webpack/index.d.ts
+++ b/types/webpack/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for webpack 2.2
+// Type definitions for webpack 3.0
 // Project: https://github.com/webpack/webpack
 // Definitions by: Qubo <https://github.com/tkqubo>
 //                 Matt Lewis <https://github.com/mattlewis92>
@@ -881,6 +881,7 @@ declare namespace webpack {
     }
 
     namespace optimize {
+        class ModuleConcatenationPlugin extends Plugin {}
         class AggressiveMergingPlugin extends Plugin {
             constructor(options?: AggressiveMergingPlugin.Options);
         }