diff --git a/debian/README.source b/debian/README.source
index 7de394683e..65af3e3e7d 100644
--- a/debian/README.source
+++ b/debian/README.source
@@ -5,4 +5,7 @@ syslibs		:now 9.x in main, needs packages in NEW
 master-8	:created to continue working on gitlab 8.x when master moved
  to 9 (since 9.x upload in unstable, this branch is not relevant)
 stretch		:now 8.x in main, security updates for stretch
-master-8.13	:temporary branch created for backporting security fixes  
+master-8.13	:temporary branch created for backporting security fixes
+
+Create master-10 till 10.x is ready for unstable. Security updates should be
+in stretch branch or in temporary branches created from it.