--- a/langtools/test/jdk/javadoc/tool/CheckResourceKeys.java	Wed Aug 10 13:52:02 2016 -0700
+++ b/langtools/test/jdk/javadoc/tool/CheckResourceKeys.java	Wed Aug 10 15:47:46 2016 -0700
@@ -148,7 +148,7 @@
             if (codeKeys.contains(rk))
                 continue;
 
-            error("Resource key not found in code: " + rk);
+            error("Resource key not found in code: '" + rk + '"');
         }
     }