diff --git a/memcheck/tests/supp-dir.vgtest b/memcheck/tests/supp-dir.vgtest
index f3e9dc394..d045724db 100644
--- a/memcheck/tests/supp-dir.vgtest
+++ b/memcheck/tests/supp-dir.vgtest
@@ -1,2 +1,3 @@
+# This tests the fix for bug 197456.
 prog: ../../tests/true
 vgopts: --suppressions=x86/