diff --git a/src/modules/services-systemd/services-systemd.conf b/src/modules/services-systemd/services-systemd.conf
index d84cd1349..6e7f34451 100644
--- a/src/modules/services-systemd/services-systemd.conf
+++ b/src/modules/services-systemd/services-systemd.conf
@@ -37,7 +37,8 @@
 #
 #   - name: "cups.socket"
 #     action: "disable" 
-#     mandatory: false
+#     # The property "mandatory" is taken to be false by default here
+#     # because it is not specified
 #
 #   - name: "graphical"
 #     action: "enable"