diff --git a/lib/OpenLayers/Layer/Bing.js b/lib/OpenLayers/Layer/Bing.js
index 277e8d1f86..395a5d6b9c 100644
--- a/lib/OpenLayers/Layer/Bing.js
+++ b/lib/OpenLayers/Layer/Bing.js
@@ -11,7 +11,9 @@
  * Class: OpenLayers.Layer.Bing
  * Bing layer using direct tile access as provided by Bing Maps REST Services.
  * See http://msdn.microsoft.com/en-us/library/ff701713.aspx for more
- * information.
+ * information. Note: Terms of Service compliant use requires the map to be
+ * configured with an <OpenLayers.Control.Attribution> control and the
+ * attribution placed on or near the map.
  * 
  * Inherits from:
  *  - <OpenLayers.Layer.XYZ>