diff --git a/navigation/navigation.d.ts b/navigation/navigation.d.ts
index 60ff423fab..79dc718c90 100644
--- a/navigation/navigation.d.ts
+++ b/navigation/navigation.d.ts
@@ -91,6 +91,10 @@ declare namespace Navigation {
          * preserved when navigating
          */
         trackTypes: boolean;
+        /**
+         * Gets the additional state attributes
+         */
+        [extras: string]: any;        
         /**
          * Called on the old State before navigating to a different State
          * @param state The new State