diff --git a/lib/OpenLayers/Layer/WMS.js b/lib/OpenLayers/Layer/WMS.js
index 71b017a2e6..9e986714e1 100644
--- a/lib/OpenLayers/Layer/WMS.js
+++ b/lib/OpenLayers/Layer/WMS.js
@@ -40,7 +40,10 @@ OpenLayers.Layer.WMS.prototype =
      */
     reproject: true,
  
-    /** @type Boolean */
+    /**
+     * APIProperty: isBaseLayer
+     * {Boolean} Default is true for WMS layer
+     */
     isBaseLayer: true,
  
     /**