diff --git a/doc b/doc
index c18ae0f984..221a2d0935 160000
--- a/doc
+++ b/doc
@@ -1 +1 @@
-Subproject commit c18ae0f984f65194342d4d1a1eb18d5b13d3c19d
+Subproject commit 221a2d09357a09c97f35eb1410f0dc3705cd2b9d