diff --git a/README.md b/README.md
index 91f1589..1151b02 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ Add the following command definition to your commands config (`commands.config`)
 
 define command{
         command_name    <command_name>
-        command_line    /usr/bin/python /usr/local/nagios/libexec/plugins/check_http_json.py -H <host>:<port> -p <path> [-e|-q|-l|-g <rules>] [-e <metrics>]
+        command_line    /usr/bin/python /usr/local/nagios/libexec/plugins/check_http_json.py -H <host>:<port> -p <path> [-e|-q|-l|-g <rules>] [-m <metrics>]
         }
 
 ```
@@ -211,4 +211,4 @@ If I change the command to have the parameter -q parameter `State.Running,False`
 
 ```
 OK: Status OK.
-```
\ No newline at end of file
+```