diff --git a/src/as/com/threerings/util/StringUtil.as b/src/as/com/threerings/util/StringUtil.as
index 3ae3f1597..42d8dd5c2 100644
--- a/src/as/com/threerings/util/StringUtil.as
+++ b/src/as/com/threerings/util/StringUtil.as
@@ -9,6 +9,15 @@ public class StringUtil
         return (str == null) || (str.search("\\S") == -1);
     }
 
+    /**
+     * Does the specified string end with the specified substring.
+     */
+    public static function endsWith (str :String, substr :String) :Boolean
+    {
+        var startDex :int = str.length - substr.length;
+        return (startDex >= 0) && (str.indexOf(substr, startDex) > 0);
+    }
+
     /**
      * Utility function that strips whitespace from the ends of a String.
      */