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-rw-r--r--Help/variable/CMAKE_TWEAK_VERSION.rst10
1 files changed, 8 insertions, 2 deletions
diff --git a/Help/variable/CMAKE_TWEAK_VERSION.rst b/Help/variable/CMAKE_TWEAK_VERSION.rst
index a2c8f35..be2e050 100644
--- a/Help/variable/CMAKE_TWEAK_VERSION.rst
+++ b/Help/variable/CMAKE_TWEAK_VERSION.rst
@@ -1,5 +1,11 @@
CMAKE_TWEAK_VERSION
-------------------
-Fourth version number component of the :variable:`CMAKE_VERSION`
-variable.
+Defined to ``0`` for compatibility with code written for older
+CMake versions that may have defined higher values.
+
+.. note::
+
+ In CMake versions 2.8.2 through 2.8.12, this variable holds
+ the fourth version number component of the
+ :variable:`CMAKE_VERSION` variable.