README.rdoc in ruote-2.1.10 vs README.rdoc in ruote-2.1.11

@@ -10,9 +10,22 @@
 Process definitions are mainly describing how workitems are routed to participants. These participants may represent worklists for users or group of users, pieces of code, ...
 
 
 == usage
 
+grab ruote
+
+  gem install ruote
+  gem install yajl-ruby
+
+Note : the json gem has a serious bug :
+
+  http://github.com/flori/json/issues#issue/21
+
+So yajl-ruby is seriously recommended.
+
+Then
+
   require 'rubygems'
   require 'ruote'
   require 'ruote/storage/fs_storage'
 
   # preparing the engine