diff --git a/src/configure.ac b/src/configure.ac
index 44cf75185..7bc0f5f16 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -160,3 +160,12 @@ LD_SHARED="$LD_SHARED $CBIT"
 echo "CBIT is set to '$CBIT'"
 
 AC_OUTPUT
+
+echo
+echo "********************** WARNING ! ************************"
+echo "*  ejabberd trunk svn is NOT ready for real usage yet,  *"
+echo "*  because it is still in heavy development.            *"
+echo "*  Don't use ejabberd trunk yet, it is prealpha!        *"
+echo "*  Please use ejabberd 2.1.x branch.                    *"
+echo "*********************************************************"
+echo
diff --git a/src/ejabberd.app b/src/ejabberd.app
index f6d05a07c..93b9049bb 100644
--- a/src/ejabberd.app
+++ b/src/ejabberd.app
@@ -2,7 +2,7 @@
 
 {application, ejabberd,
  [{description, "ejabberd"},
-  {vsn, "3.0.0-alpha"},
+  {vsn, "3.0.0-prealpha"},
   {modules, [acl,
 	     adhoc,
 	     configure,