diff --git a/test/Analysis/array-struct.c b/test/Analysis/array-struct.c
index dd43a6d..8f4bb04 100644
--- a/test/Analysis/array-struct.c
+++ b/test/Analysis/array-struct.c
@@ -46,6 +46,7 @@
 }
 
 // Struct variable in lvalue context.
+// Assign UnknownVal to the whole struct.
 void f5() {
   struct s data;
   g1(&data);