diff --git a/marionette/marionette.d.ts b/marionette/marionette.d.ts
index 2b9b25635..4a2bfac10 100644
--- a/marionette/marionette.d.ts
+++ b/marionette/marionette.d.ts
@@ -1291,6 +1291,15 @@ declare module Marionette {
 
         options: any;
 
+		/**
+         * Behaviors can have their own ui hash, which will be mixed into the ui
+         * hash of its associated View instance. ui elements defined on either the
+         * Behavior or the View will be made available within events and triggers.
+         * They also are attached directly to the Behavior and can be accessed within
+         * Behavior methods as this.ui.
+         */
+        ui: any;
+		
         /**
          * Any triggers you define on the Behavior will be triggered in response to the appropriate event on the view.
          */