2.7 -> 3.1 versionchanges.
diff --git a/Doc/c-api/init.rst b/Doc/c-api/init.rst
index ab4734f..299af7f 100644
--- a/Doc/c-api/init.rst
+++ b/Doc/c-api/init.rst
@@ -824,8 +824,7 @@
    other system thread.  If it is a Python thread, it doesn't matter if it holds
    the global interpreter lock or not.
 
-   .. versionadded:: 2.7
-
+   .. versionadded:: 3.1
 
 
 .. _profiling: