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-rw-r--r--Help/prop_sf/COMPILE_DEFINITIONS.rst10
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diff --git a/Help/prop_sf/COMPILE_DEFINITIONS.rst b/Help/prop_sf/COMPILE_DEFINITIONS.rst
index 1626825..8d2108c 100644
--- a/Help/prop_sf/COMPILE_DEFINITIONS.rst
+++ b/Help/prop_sf/COMPILE_DEFINITIONS.rst
@@ -17,3 +17,13 @@ by the native build tool. Xcode does not support per-configuration
definitions on source files.
.. include:: /include/COMPILE_DEFINITIONS_DISCLAIMER.txt
+
+Contents of ``COMPILE_DEFINITIONS`` may use "generator expressions"
+with the syntax ``$<...>``. See the :manual:`cmake-generator-expressions(7)`
+manual for available expressions. However, :generator:`Xcode`
+does not support per-config per-source settings, so expressions
+that depend on the build configuration are not allowed with that
+generator.
+
+Generator expressions should be preferred instead of setting the alternative per-configuration
+property.