diff --git a/Doc/c-api/init.rst b/Doc/c-api/init.rst
index 377724c623e..6f847d94e16 100644
--- a/Doc/c-api/init.rst
+++ b/Doc/c-api/init.rst
@@ -665,6 +665,8 @@ with sub-interpreters:
    knowing that the GIL is locked can allow the caller to perform sensitive
    actions or otherwise behave differently.
 
+   .. versionadded:: 3.4
+
 
 The following macros are normally used without a trailing semicolon; look for
 example usage in the Python source distribution.