diff --git a/pointerevents/pointerevent_capture_mouse.html b/pointerevents/pointerevent_capture_mouse.html
index 61a933afd86a7e..cf2f7f668cc7a6 100644
--- a/pointerevents/pointerevent_capture_mouse.html
+++ b/pointerevents/pointerevent_capture_mouse.html
@@ -139,7 +139,7 @@ <h4>
                 on_event(target1, "pointermove", function (event) {
                     test(function() {
                         assert_false(isPointerCapture, "pointermove shouldn't trigger for this target when capture is enabled");
-                    }, "pointermove shouldn't trigger for the purple rectangle while the black rectangle has capture");
+                    }, "pointermove shouldn't trigger for the purple rectangle while the black rectangle has capture - isPointerCapture is " + isPointerCapture);
 
                     if(!pointermoveNoCaptureGot1) {
                         actions_promise3 = actions_promise2.then( () => {