diff --git a/Help/prop_tgt/COMPILE_WARNING_AS_ERROR.rst b/Help/prop_tgt/COMPILE_WARNING_AS_ERROR.rst
index 32fdcd4a64..19323cb39b 100644
--- a/Help/prop_tgt/COMPILE_WARNING_AS_ERROR.rst
+++ b/Help/prop_tgt/COMPILE_WARNING_AS_ERROR.rst
@@ -5,6 +5,8 @@ COMPILE_WARNING_AS_ERROR
 
 Specify whether to treat warnings on compile as errors.
 If enabled, adds a flag to treat warnings on compile as errors.
+If the ``--compile-no-warning-as-error`` option is given on the
+:manual:`cmake(1)` command line, this property is ignored.
 
 This property is not implemented for all compilers.  It is silently ignored
 if there is no implementation for the compiler being used.  The currently