reaction plugin: chance was not actually optional

diff --git a/data/rbot/plugins/reaction.rb b/data/rbot/plugins/reaction.rb
index 9150d23ec2459829ad54c8693b0b6836eb89c3ce..ef2e85da2f95d093f73c5572c112120fb254cad0 100644 (file)
--- a/data/rbot/plugins/reaction.rb
+++ b/data/rbot/plugins/reaction.rb
@@ -135,7 +135,7 @@ end
 
 class ReactionPlugin < Plugin
 
-  ADD_SYNTAX = 'react to *trigger with *reply at :chance chance'
+  ADD_SYNTAX = 'react to *trigger with *reply [at :chance chance]'
 
   def add_syntax
     return ADD_SYNTAX