diff --git a/datastore_server/dist/etc/service.properties b/datastore_server/dist/etc/service.properties
index bbe9232ea32db75dd9ae174ddf15b63d6e8a1393..3d049f1295404bbc9bfef2413b9bfd089ee2295c 100644
--- a/datastore_server/dist/etc/service.properties
+++ b/datastore_server/dist/etc/service.properties
@@ -175,6 +175,7 @@ main-thread.incoming-data-completeness-condition = marker-file
 # Mandatory properties for each <plugin> include: 
 #   <plugin>.class - Fully qualified plugin class name
 #   <plugin>.interval - The time between plugin executions (in seconds)
+# Optional properties for each <plugin> include:
 #   <plugin>.start - Time of the first execution (hh:mm)
 #maintenance-plugins =