diff --git a/doc/Extensions/Services.md b/doc/Extensions/Services.md
index ca2e14ed3..ddae31f27 100644
--- a/doc/Extensions/Services.md
+++ b/doc/Extensions/Services.md
@@ -48,3 +48,4 @@ no graphs will be generated. **
 - smtp
 - pop
 - simap
+- ntp
diff --git a/includes/services/ntp/check.inc b/includes/services/ntp/check.inc
new file mode 100644
index 000000000..8115e55ad
--- /dev/null
+++ b/includes/services/ntp/check.inc
@@ -0,0 +1,13 @@
+<?php
+
+$check = shell_exec($config['nagios_plugins'] . "/check_ntp -H ".$service['hostname']." ".$service['service_param']);
+
+list($check, $time) = split("\|", $check);
+
+if(strstr($check, "NTP OK")) {
+  $status = '1';
+} else {
+  $status = '0';
+}
+
+?>