README.md in zhong-0.1.7 vs README.md in zhong-0.1.8

@@ -32,18 +32,17 @@
     every(1.second, "compute", if: -> (t) { t.wday == 3 && rand < 0.5 }) do
       puts "something happened on wednesday, maybe"
     end
   end
 
-  # note: callbacks that return nil or false will cause event to not run
+  # note: callbacks that explicitly false will cause event to not run
   on(:before_tick) do
     puts "ding"
     true
   end
 
   on(:after_tick) do
     puts "dong"
-    true
   end
 
   on(:before_run) do |job, time|
     puts "running #{job}"
     true # can conditionally run a specific job