diff --git a/tests/ui/compiletest-self-test/compile-flags-last.stderr b/tests/ui/compiletest-self-test/compile-flags-last.stderr
index d8d40a7d9f1..72d92206e2b 100644
--- a/tests/ui/compiletest-self-test/compile-flags-last.stderr
+++ b/tests/ui/compiletest-self-test/compile-flags-last.stderr
@@ -1,2 +1,5 @@
 error: Argument to option 'cap-lints' missing
+       Usage:
+           --cap-lints LEVEL   Set the most restrictive lint level. More restrictive
+                               lints are capped at this level