diff --git a/src/core.js b/src/core.js
index 07d5caf57..008a88c22 100644
--- a/src/core.js
+++ b/src/core.js
@@ -739,6 +739,7 @@ jQuery.extend({
 			}
 		}
 
+		// Flatten any nested arrays
 		return ret.concat.apply( [], ret );
 	},