Update documentation

README.md

@@ -1,6 +1,8 @@
 # hubot-audit
 
 log all hubot interaction to an audit channel
+We found this helpful to audit hubot history in one central place, including commands issued in multiple channels.
+We recommend setting the channel mode to 'moderated', so that no additional noise, comments and catpics get (accidently) added there.
 
 See [`src/audit.coffee`](src/audit.coffee) for full documentation.
 
@@ -19,5 +21,5 @@ Then add **hubot-audit** to your `external-scripts.json`:
 ```
 
 ## Sample Interaction
-# None, bot will passively log all interaction
+None, bot will passively log all interaction