diff --git a/doc/part-0x09.rst b/doc/part-0x09.rst
index 6ce1f4b..84606dd 100644
--- a/doc/part-0x09.rst
+++ b/doc/part-0x09.rst
@@ -77,3 +77,4 @@ or ``execute``, so that gets updated too. The end result is::
         hello, world
         finished
 
+As usual, the code is tagged with `part-0x09 <https://github.com/kisom/kforth/tree/part-0x09>`_.
\ No newline at end of file