diff --git a/README.md b/README.md
index 5755655..cb8f29e 100644
--- a/README.md
+++ b/README.md
@@ -4,20 +4,17 @@ A Slack integration to notify Docker events.
 
 ![slack-docker-0.1.1](https://cloud.githubusercontent.com/assets/321266/4773935/0141e0e8-5ba8-11e4-8b35-601e898c58be.png)
 
-## Run
+## How to Run
 
-Set up [an incoming WebHook integration](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 Webhook URL.
 
-Run a container
+Run a container as follows:
 
 ```sh
-docker run -d -v /var/run/docker.sock:/var/run/docker.sock -e webhook=URL -e channel=infra int128/slack-docker
+docker run -d -e webhook=URL -v /var/run/docker.sock:/var/run/docker.sock int128/slack-docker
 ```
 
-with following environment variables.
-
-* `webhook` is the Webhook URL like `https://hooks.slack.com/services/...`
-* `channel` is the channel without hash prefix. Default is `general`.
+Replace `URL` with your Webhook URL like `https://hooks.slack.com/services/...`
 
 
 ## Contribution
diff --git a/app.coffee b/app.coffee
index 1ef5689..9c87bfd 100644
--- a/app.coffee
+++ b/app.coffee
@@ -51,7 +51,7 @@ notify = (name, text, fields) ->
   slack.send
     username: "docker#{name}"
     icon_emoji: ':whale:'
-    channel: '#' + process.env.channel || 'general'
+    channel: ''
     text: text
     fields: fields