diff --git a/doc b/doc
index 78c66b3..971dd2a 160000
--- a/doc
+++ b/doc
@@ -1 +1 @@
-Subproject commit 78c66b37266707a3cf2904c3891b08cddae8d83e
+Subproject commit 971dd2a4fadac9cdab174c523c22df79efd63aa5