diff --git a/src/core/system.conf.in b/src/core/system.conf.in
index a4e79d3033..71a5869ec0 100644
--- a/src/core/system.conf.in
+++ b/src/core/system.conf.in
@@ -66,7 +66,7 @@
 #DefaultLimitNOFILE=1024:{{HIGH_RLIMIT_NOFILE}}
 #DefaultLimitAS=
 #DefaultLimitNPROC=
-#DefaultLimitMEMLOCK=
+#DefaultLimitMEMLOCK=8M
 #DefaultLimitLOCKS=
 #DefaultLimitSIGPENDING=
 #DefaultLimitMSGQUEUE=