diff --git a/monit/README.md b/monit/README.md
index d222060..cebb00f 100644
--- a/monit/README.md
+++ b/monit/README.md
@@ -19,6 +19,8 @@ directories and filesystems on a Unix system.
     └── monitrc
 ```
 
+> Make sure config file endswith `.cfg`.
+
 ## docker-compose.yml
 
 ```
diff --git a/monit/monit/monitrc b/monit/monit/monitrc
index eb1a44a..b56c59a 100644
--- a/monit/monit/monitrc
+++ b/monit/monit/monitrc
@@ -8,4 +8,4 @@ set pidfile /var/run/monit.pid
 set idfile /var/lib/monit/monit.id
 set statefile /var/lib/monit/monit.state
 set eventqueue basedir /var/lib/monit/events slots 5000
-include /etc/monit/conf.d/*
+include /etc/monit/conf.d/*.cfg