diff --git a/types/react-native-google-signin/index.d.ts b/types/react-native-google-signin/index.d.ts
index a114a06882..54e19715e1 100644
--- a/types/react-native-google-signin/index.d.ts
+++ b/types/react-native-google-signin/index.d.ts
@@ -3,6 +3,7 @@
 // Definitions by: Jacob Froman <https://github.com/j-fro>
 //                 Michele Bombardi <https://github.com/bm-software>
 //                 Christian Chown <https://github.com/christianchown>
+//                 Eric Chen <https://github.com/echentw>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.8
 
@@ -53,6 +54,11 @@ export interface ConfigureParams {
      */
     webClientId?: string;
 
+    /**
+     * If you want to specify the client ID of type iOS
+     */
+    iosClientId?: string;
+
     /**
      * Must be true if you wish to access user APIs on behalf of the user from
      * your own server