diff --git a/Help/manual/ctest.1.rst b/Help/manual/ctest.1.rst
index a5b27b61cd..9f7c72e47e 100644
--- a/Help/manual/ctest.1.rst
+++ b/Help/manual/ctest.1.rst
@@ -354,6 +354,8 @@ Run Tests
 
 .. option:: --test-dir <dir>
 
+ .. versionadded:: 3.20
+
  Specify the directory in which to look for tests, typically a CMake project
  build directory. If not specified, the current directory is used.