diff --git a/include/windows.foundation.collections.idl b/include/windows.foundation.collections.idl
index 395adad27aa..567c411e129 100644
--- a/include/windows.foundation.collections.idl
+++ b/include/windows.foundation.collections.idl
@@ -24,6 +24,7 @@ import "inspectable.idl";
 import "asyncinfo.idl";
 import "windowscontracts.idl";
 /* import "eventtoken.idl"; */
+import "ivectorchangedeventargs.idl";
 
 namespace Windows {
     namespace Foundation {
@@ -105,6 +106,16 @@ cpp_quote("#endif")
                 HRESULT First([out, retval] Windows.Foundation.Collections.IIterator<T> **value);
             }
 
+            [
+                contract(Windows.Foundation.FoundationContract, 1.0),
+                uuid(9939f4df-050a-4c0f-aa60-77075f9c4777)
+            ]
+            interface IMapChangedEventArgs<T> : IInspectable
+            {
+                [propget] HRESULT CollectionChanged([out, retval] Windows.Foundation.Collections.CollectionChange *value);
+                [propget] HRESULT Key([out, retval] T *key);
+            }
+
             [
                 contract(Windows.Foundation.FoundationContract, 1.0),
                 uuid(02b51929-c1c4-4a7e-8940-0312b5c18500)