diff --git a/Help/manual/cmake-generator-expressions.7.rst b/Help/manual/cmake-generator-expressions.7.rst
index 994977229e..7a6188aafe 100644
--- a/Help/manual/cmake-generator-expressions.7.rst
+++ b/Help/manual/cmake-generator-expressions.7.rst
@@ -521,7 +521,7 @@ in cmake-style format.
 
   See :ref:`cmake_path(REMOVE_EXTENSION) <REMOVE_EXTENSION>` for more details.
 
-.. genex:: $<PATH:REPLACE_EXTENSION[,LAST_ONLY],path>
+.. genex:: $<PATH:REPLACE_EXTENSION[,LAST_ONLY],path,input>
 
   .. versionadded:: 3.24