diff --git a/src/Compilers/Core/Portable/Interop/IVsSQM.cs b/src/Compilers/Core/Portable/Interop/IVsSQM.cs
index b860045f6256f4198364b4aae311b53a6176740f..fc35bfe884948ca5994d2e5d6482e000aafa4ef9 100644
--- a/src/Compilers/Core/Portable/Interop/IVsSQM.cs
+++ b/src/Compilers/Core/Portable/Interop/IVsSQM.cs
@@ -1,5 +1,8 @@
 // Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
 
+// WARNING: THIS FILE IS BEING CONSUMED THROUGH INTERNALSVISIBLETO
+// BY THE RULSET EDITOR. Until you fix that, do not delete this file.
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 //