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diff --git a/Modules/CheckIPOSupported.cmake b/Modules/CheckIPOSupported.cmake
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@@ -5,6 +5,8 @@
CheckIPOSupported
-----------------
+.. versionadded:: 3.9
+
Check whether the compiler supports an interprocedural optimization (IPO/LTO).
Use this before enabling the :prop_tgt:`INTERPROCEDURAL_OPTIMIZATION` target
property.