diff --git a/UPGRADING b/UPGRADING
index e6466d3cfcaff..40117191257cd 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -1171,6 +1171,8 @@ PHP 8.4 UPGRADE NOTES
 * Building with Visual Studio now requires at least Visual Studio 2019 (Visual
   Studio 2022 is recommended, though).
 
+* AVX(2) CPU support is now properly detected for MSVC builds.
+
 * Native AVX-512 builds are now supported (--enable-native-intrinsics=avx512).
 
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