Refine installation instruction
@@ -48,22 +48,22 @@ Installation
------------
Install the plugin package from either the yum or the apt repository.
+To setup those package repositories, see documentation about installation of mackerel-agent ([https://mackerel.io/docs/entry/howto/install-agent/rpm](rpm) / [https://mackerel.io/docs/entry/howto/install-agent/deb](deb)).
-### CentOS 5/6
+mackerel-check-plugins will be installed to ```/usr/local/bin/check-*```.
+
+### yum
```shell
yum install mackerel-check-plugins
```
-### Debian 6/7
+### apt
```shell
apt-get install mackerel-check-plugins
```
-mackerel-check-plugins will be installed to ```/usr/local/bin/check-*```.
-
-
Use check plugins in Mackerel
-----------------------------
