diff --git a/react/react-global.d.ts b/react/react-global.d.ts
index 99fba1e3de..3141d2f87b 100644
--- a/react/react-global.d.ts
+++ b/react/react-global.d.ts
@@ -85,14 +85,19 @@ declare namespace __React {
     // Reat.addons.update
     // ----------------------------------------------------------------------
 
-    interface UpdateSpec {
+    interface UpdateSpecCommand {
         $set?: any;
         $merge?: {};
         $apply?(value: any): any;
-        // [key: string]: UpdateSpec;
     }
-
-    interface UpdateArraySpec extends UpdateSpec {
+    
+    interface UpdateSpecPath {
+        [key: string]: UpdateSpec;
+    }
+    
+    type UpdateSpec = UpdateSpecCommand | UpdateSpecPath;
+    
+    interface UpdateArraySpec extends UpdateSpecCommand {
         $push?: any[];
         $unshift?: any[];
         $splice?: any[][];
diff --git a/react/react.d.ts b/react/react.d.ts
index f2f4bc0e6b..3ccd648a4d 100644
--- a/react/react.d.ts
+++ b/react/react.d.ts
@@ -1690,15 +1690,20 @@ declare module "react/addons" {
     //
     // Reat.addons.update
     // ----------------------------------------------------------------------
-
-    interface UpdateSpec {
+    
+    interface UpdateSpecCommand {
         $set?: any;
         $merge?: {};
         $apply?(value: any): any;
-        // [key: string]: UpdateSpec;
     }
-
-    interface UpdateArraySpec extends UpdateSpec {
+    
+    interface UpdateSpecPath {
+        [key: string]: UpdateSpec;
+    }
+    
+    type UpdateSpec = UpdateSpecCommand | UpdateSpecPath;
+    
+    interface UpdateArraySpec extends UpdateSpecCommand {
         $push?: any[];
         $unshift?: any[];
         $splice?: any[][];