README.md in clockwork-0.4.0 vs README.md in clockwork-0.4.1

@@ -123,11 +123,26 @@
 
     every(1.day, 'reminders.send', :at => '00:00', :tz => 'UTC')
     # Runs the job each day at midnight, UTC.
     # The value for :tz can be anything supported by [TZInfo](http://tzinfo.rubyforge.org/)
 
+### :if
 
+`:if` parameter is invoked every time the task is ready to run, and run if the
+return value is true.
+
+Run on every first day of month.
+
+    Clockwork.every(1.day, 'myjob', :if => lambda { |t| t.day == 1 })
+
+The argument is an instance of `Time`.  If `:tz` option is set, it is local time.
+
+This argument cannot be omitted.  Please use _ as placeholder if not needed.
+
+    Clockwork.every(1.second, 'myjob', :if => lambda { |_| true })
+
+
 Configuration
 -----------------------
 
 Clockwork exposes a couple of configuration options you may change:
 
@@ -213,15 +228,15 @@
 Meta
 ----
 
 Created by Adam Wiggins
 
-Inspired by [rufus-scheduler](http://rufus.rubyforge.org/rufus-scheduler/) and [http://github.com/bvandenbos/resque-scheduler](resque-scehduler)
+Inspired by [rufus-scheduler](http://rufus.rubyforge.org/rufus-scheduler/) and [resque-scehduler](http://github.com/bvandenbos/resque-scheduler)
 
 Design assistance from Peter van Hardenberg and Matthew Soldo
 
 Patches contributed by Mark McGranaghan and Lukáš Konarovský
 
 Released under the MIT License: http://www.opensource.org/licenses/mit-license.php
 
-http://github.com/adamwiggins/clockwork
+http://github.com/tomykaira/clockwork