diff --git a/conf/bind_add_dkim_zone_master.conf.sample b/conf/bind_add_dkim_zone_master.conf.sample
index 9caeecc..4912610 100644
--- a/conf/bind_add_dkim_zone_master.conf.sample
+++ b/conf/bind_add_dkim_zone_master.conf.sample
@@ -4,7 +4,7 @@
 
 # - SOA_PRIMARY_MASTER
 # -
-# - Primary master for all zones
+# - Primary master for new DKIM zones _domainkey.*
 # -
 # - Example: SOA_PRIMARY_MASTER="a.ns.oopen.de"
 # -