diff --git a/conf/file-server.ini b/conf/file-server.ini
index b0aafc8..d0b1f16 100644
--- a/conf/file-server.ini
+++ b/conf/file-server.ini
@@ -7,6 +7,12 @@
 # Log is compacted on start (deleted objects are removed).
 enable: on
 
+# Undelivered messages are optionally saved and restored when the server restarts,
+# they are preserved in the .bak file until the next restart.
+restore_messages: on
+#expire_messages_days: 21
+
+# Log daily server statistics to CSV file
 log_stats: off
 
 [AUTH]