diff --git a/tests_errors/ref-varying.ispc b/tests_errors/ref-varying.ispc
index e7c53dae..ee34bcd1 100644
--- a/tests_errors/ref-varying.ispc
+++ b/tests_errors/ref-varying.ispc
@@ -1,4 +1,4 @@
-// fff
+// Illegal to pass a "varying" lvalue
 
 void foo(float &x) {
     ++x;