diff --git a/jquery.notifyBar/jquery.notifyBar.d.ts b/jquery.notifyBar/jquery.notifyBar.d.ts
index 22e012673..bbfb59bc3 100644
--- a/jquery.notifyBar/jquery.notifyBar.d.ts
+++ b/jquery.notifyBar/jquery.notifyBar.d.ts
@@ -18,6 +18,13 @@ declare module JQueryNotifyBar {
          */
         delay?: number;
 
+        /**
+         * How long this bar will be slided up and down.
+         *
+         * Default: "normal"
+         */
+        animationSpeed?: string | number;
+
         /**
          * Custom jQuery object for notify bar.
          */