diff --git a/d3/d3.d.ts b/d3/d3.d.ts
index 6c7f356e6e..4bb10a5d16 100644
--- a/d3/d3.d.ts
+++ b/d3/d3.d.ts
@@ -719,6 +719,7 @@ declare module D3 {
             (name: string): string;
             (name: string, value: any): Selection;
             (name: string, valueFunction: (data: any, index: number) => any): Selection;
+            (classValueMap: Object): Selection;
         };
 
         style: {