Add versionadded info
diff --git a/Doc/api/init.tex b/Doc/api/init.tex
index 67f74a1..91a5c52 100644
--- a/Doc/api/init.tex
+++ b/Doc/api/init.tex
@@ -276,6 +276,7 @@
   Return a string representing the Subversion revision that this Python
   executable was built from.  This number is a string because it may contain a
   trailing 'M' if Python was built from a mixed revision source tree.
+  \versionadded{2.5}
 \end{cfuncdesc}
 
 \begin{cfuncdesc}{const char*}{Py_GetPlatform}{}