diff --git a/Mac/README.rst b/Mac/README.rst
index 7476639d0ff..bc40b41f7f3 100644
--- a/Mac/README.rst
+++ b/Mac/README.rst
@@ -10,6 +10,19 @@ Python on macOS README
 This document provides a quick overview of some macOS specific features in
 the Python distribution.
 
+Compilers for building on macOS
+===============================
+
+The core developers primarily test builds on macOS with Apple's compiler tools,
+either Xcode or the Command Line Tools.  For these we only support building with
+a compiler that includes an SDK that targets the OS on the build machine, that is
+the version of Xcode that shipped with the OS version or one newer.
+
+For example, for macOS 12 we support Xcode 13 and Xcode 14 (or the corresponding
+Command Line Tools).
+
+Building with other compilers, such as GCC, likely works, but is not actively supported.
+
 macOS specific arguments to configure
 =====================================