add tips section

Readme.md

@@ -37,6 +37,10 @@ or `each_with_index` or `map_with_index`
 
 Processes/Threads are workers, they grab the next piece of work when they finish
 
+Tips
+====
+ - [ActiveRecord] `ActiveRecord::Base.allow_concurrency = true` or do a `ActiveRecord::Base.connection.reconnect!` inside the block
+
 TODO
 ====
  - JRuby / Windows support <-> possible ?
@@ -57,4 +61,4 @@ Authors
 
 [Michael Grosser](http://grosser.it)<br/>
 michael@grosser.it<br/>
-Hereby placed under public domain, do what you want, just do not hold me accountable...
+Hereby placed under public domain, do what you want, just do not hold me accountable...