diff --git a/roles/copr/backend/templates/copr-be.conf b/roles/copr/backend/templates/copr-be.conf
index d361ff9454..e295cfbab9 100644
--- a/roles/copr/backend/templates/copr-be.conf
+++ b/roles/copr/backend/templates/copr-be.conf
@@ -19,6 +19,7 @@ group0_archs=i386,x86_64
 group0_spawn_playbook=/home/copr/provision/builderpb.yml
 group0_terminate_playbook=/home/copr/provision/terminatepb.yml
 group0_max_workers=7
+# please don't set more, 12 builders leads to frequient OpenStack deniel of service 
 
 # path to ansible playbook which spawns builder
 # see /usr/share/copr*/playbooks/ for examples