diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8b57472..c44ceba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,6 +2,9 @@
 # Distributed under the Boost Software License, Version 1.0.
 # See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt
 
+# Partial (add_subdirectory only) and experimental CMake support
+# Subject to change; please do not rely on the contents of this file yet
+
 cmake_minimum_required(VERSION 3.5)
 project(BoostThrowException LANGUAGES CXX)