diff --git a/index.php b/index.php
index <HASH>..<HASH> 100644
--- a/index.php
+++ b/index.php
@@ -88,6 +88,9 @@
     $PAGE->set_heading($SITE->fullname);
     echo $OUTPUT->header();
 
+    //TODO: remove this notice once admins know they need to switch CVS and git branches, the reason is once we start changing DB there will not be any way back!
+    echo $OUTPUT->box('WARNING: this site is using 2.1dev codebase, please make sure this is is not a production server!!!', 'errorbox');
+
 /// Print Section
     if ($SITE->numsections > 0) {
MDL-<I> make sure admins do not upgrade to <I>dev accidentally

We already have the new maturity warning in the upgrade page but we are not changing versions yet, we should better give admins one extra chance to go back to latest <I>+ stable.