1 files changed, 3 insertions, 1 deletions
diff --git a/lib/plum/event_emitter.rb b/lib/plum/event_emitter.rb
index 90484fc..572900e 100644
--- a/lib/plum/event_emitter.rb
+++ b/lib/plum/event_emitter.rb
@@ -1,12 +1,14 @@
 module Plum
   module EventEmitter
     # Registers an event handler to specified event. An event can have multiple handlers.
-    # @param name [String] The name of event.
+    # @param name [Symbol] The name of event.
     # @yield Gives event-specific parameters.
     def on(name, &blk)
       (callbacks[name] ||= []) << blk
     end
 
+    # Invokes an event and call handlers with args.
+    # @param name [Symbol] The identifier of event.
     def callback(name, *args)
       (cbs = callbacks[name]) && cbs.each {|cb| cb.call(*args) }
     end