diff --git a/angular-material/index.d.ts b/angular-material/index.d.ts
index 9118cd92c2..0e27fe3b60 100644
--- a/angular-material/index.d.ts
+++ b/angular-material/index.d.ts
@@ -106,6 +106,7 @@ declare module 'angular' {
             onComplete?: Function;
             onRemoving?: Function;
             skipHide?: boolean;
+            multiple?: boolean;
             fullscreen?: boolean; // default: false
         }