diff --git a/chrome/chrome.d.ts b/chrome/chrome.d.ts
index 19d5c4d0bd..17c57c88d1 100755
--- a/chrome/chrome.d.ts
+++ b/chrome/chrome.d.ts
@@ -1082,6 +1082,7 @@ declare module chrome.history {
 ////////////////////
 declare module chrome.identity {
     var getAuthToken: (options: any, cb: (token: {}) => void) => void;
+    var launchWebAuthFlow: (options: any, cb: (redirect_url: string) => void) => void;
 }