diff --git a/test/render.test.js b/test/render.test.js
index 1329b7ef5..17f9bd228 100644
--- a/test/render.test.js
+++ b/test/render.test.js
@@ -103,7 +103,7 @@ function renderTest(style, info, base, key) {
                             height: info.height || 512
                         });
 
-                        t.ok(difference <= allowedDifference);
+                        t.ok(difference <= allowedDifference, 'actual matches expected');
                         t.end();
                     }
                 });