Improve README; check-load
-check-load
-==========
+# check-load
+
+## Description
Check system load average.
## Synopsis
+```
+check-load -w 4,3,2 -c 3,2,1
+```
+
+## Installation
-```shell
-check-load [-r] -w <WL1>,<WL5>,<WL15> -c <CL1>,<CL5>,<CL15>
+First, build this program.
+
+```
+go get github.com/mackerelio/go-check-plugins
+cd $(go env GOPATH)/src/github.com/mackerelio/go-check-plugins/check-load
+go install
+```
+
+Or you can use this program by installing the official Mackerel package. See [Using the official check plugin pack for check monitoring - Mackerel Docs](https://mackerel.io/docs/entry/howto/mackerel-check-plugins).
+
+
+Next, you can execute this program :-)
+
+```
+check-load -w 4,3,2 -c 3,2,1
```
-## References
-* [check_load](https://github.com/nagios-plugins/nagios-plugins/blob/master/plugins/check_load.c)
+## Setting for mackerel-agent
+
+If there are no problems in the execution result, add s setting in mackerel-agent.conf .
+
+```
+[plugin.checks.check-load-sample]
+command = ["check-load", "-w", "4,3,2", "-c", "3,2,1"]
+```
+
+## Usage
+### Options
+
+```
+ -w, --warning=WL1,WL5,WL15 Warning threshold for loadavg1,5,15
+ -c, --critical=CL1,CL5,CL15 Critical threshold for loadavg1,5,15
+ -r, --percpu Divide the load averages by cpu count
+```
+
+## For more information
+
+Please execute `check-load -h` and you can get command line options.
+
+## References
+- [check_load](https://github.com/nagios-plugins/nagios-plugins/blob/master/plugins/check_load.c)
\ No newline at end of file
