diff --git a/README.md b/README.md
index 5db8fae..a11d874 100644
--- a/README.md
+++ b/README.md
@@ -1,13 +1,13 @@
 # slack-docker
 
-Slack integration that notifies Docker events on your host.
+A Slack integration to notify Docker events.
 
 
-## How to Run
+## Run
 
-Set up [an incoming WebHook](https://my.slack.com/services/new/incoming-webhook) and get the token.
+Set up [an incoming WebHook integration](https://my.slack.com/services/new/incoming-webhook) and get the token.
 
-Run a container,
+Run a container
 
 ```sh
 docker run -d -v /var/run/docker.sock:/var/run/docker.sock -e domain=DOMAIN -e token=TOKEN -e channel=infra int128/slack-docker
@@ -15,7 +15,11 @@ docker run -d -v /var/run/docker.sock:/var/run/docker.sock -e domain=DOMAIN -e t
 
 with following environment variables.
 
-* `domain` is the first part of your .slack.com. (Mandatory)
-* `token` is the token provided on the integration setup page. (Mandatory)
-* `channel` is the channel without hash prefix. (Default is `general`)
+* `domain` is the first part of your .slack.com.
+* `token` is the token provided on the integration page.
+* `channel` is the channel without hash prefix. Default is `general`.
 
+
+## Contribution
+
+Please let me know an issue or pull request.