diff --git a/test/Modules/Inputs/HasSubModules.framework/Frameworks/Sub.framework/PrivateHeaders/SubPriv.h b/test/Modules/Inputs/HasSubModules.framework/Frameworks/Sub.framework/PrivateHeaders/SubPriv.h
index cbbf392918c3cf1adb94fbec068a58c6ebf43723..cda5199f637107a7db2e379b2f92876ef2b41939 100644
--- a/test/Modules/Inputs/HasSubModules.framework/Frameworks/Sub.framework/PrivateHeaders/SubPriv.h
+++ b/test/Modules/Inputs/HasSubModules.framework/Frameworks/Sub.framework/PrivateHeaders/SubPriv.h
@@ -1,2 +1,3 @@
 #include <Sub/Types.h>
-// Private
+// This comment ensures that this file is not identical to
+// HasSubModules.framework/Frameworks/Sub.framework/Headers/Sub.h