diff --git a/clang/test/CodeGen/ignore-overflow-pattern.c b/clang/test/CodeGen/ignore-overflow-pattern.c
index c4a9d07b07aaa..4e5ed82d7967e 100644
--- a/clang/test/CodeGen/ignore-overflow-pattern.c
+++ b/clang/test/CodeGen/ignore-overflow-pattern.c
@@ -21,7 +21,10 @@
 // unsigned negation, for example:
 // unsigned long A = -1UL;
 
+// Skip over parts of the IR containing this file's name.
+// CHECK: source_filename = {{.*}}
 
+// Ensure we don't see anything about handling overflow before the tests below.
 // CHECK-NOT: handle{{.*}}overflow
 
 extern unsigned a, b, c;