allow refs/heads/users/* only to known non-troll users
diff --git a/groups b/groups
index 0c684a4..57894d2 100644
--- a/groups
+++ b/groups
@@ -3,6 +3,7 @@
147b3de9543270b1b23526883b1bf91ec5ad42a0 Administrators
2711f8677a316d19c7f15f30bcf25c2ffb706ead Non-Interactive Users
b588ccf0327cd98b42a4ac07213796de29f6205b sysmocom branch access
+f3f46fd3a6951dd36adfab6c1a6ebfced2d45e78 known users
f4d0b57d31558a3f33e2199e3f75d2900b1ff638 Reviewers
global:Anonymous-Users Anonymous Users
global:Project-Owners Project Owners