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diff --git a/Help/variable/CMAKE_COMPILER_IS_GNUCXX.rst b/Help/variable/CMAKE_COMPILER_IS_GNUCXX.rst
index f1f5cf7976..e67718a5c8 100644
--- a/Help/variable/CMAKE_COMPILER_IS_GNUCXX.rst
+++ b/Help/variable/CMAKE_COMPILER_IS_GNUCXX.rst
@@ -1,5 +1,7 @@
CMAKE_COMPILER_IS_GNUCXX
------------------------
+.. versionadded:: 3.7
+
True if the C++ (``CXX``) compiler is GNU.
Use :variable:`CMAKE_CXX_COMPILER_ID <CMAKE_<LANG>_COMPILER_ID>` instead.