diff --git a/lib/OpenLayers/Map.js b/lib/OpenLayers/Map.js
index 5befd0d1b4..20841872c3 100644
--- a/lib/OpenLayers/Map.js
+++ b/lib/OpenLayers/Map.js
@@ -492,6 +492,9 @@ OpenLayers.Map.prototype = {
     addLayer: function (layer) {
         for(var i=0; i < this.layers.length; i++) {
             if (this.layers[i] == layer) {
+                var msg = "You tried to add the layer: " + layer.name + 
+                          " to the map, but it has already been added";
+                OpenLayers.Console.warn(msg);
                 return false;
             }
         }