diff --git a/lib/hiroshimarb.rb b/lib/hiroshimarb.rb
index d5c7e91..decb95f 100644
--- a/lib/hiroshimarb.rb
+++ b/lib/hiroshimarb.rb
@@ -13,8 +13,8 @@ def execute(argv)
       if command = Command.find(first)
         command.call *argv
       else
-        if first == 'asciiart'
-          command = Command.find('aa')
+        if first == 'aa'
+          command = Command.find('asciiart')
           command.call *argv
         else
           help
diff --git a/lib/hiroshimarb/commands/aa.rb b/lib/hiroshimarb/commands/asciiart.rb
similarity index 98%
rename from lib/hiroshimarb/commands/aa.rb
rename to lib/hiroshimarb/commands/asciiart.rb
index fdcf834..2fc57dd 100644
--- a/lib/hiroshimarb/commands/aa.rb
+++ b/lib/hiroshimarb/commands/asciiart.rb
@@ -2,7 +2,7 @@
 require 'hiroshimarb/command'
 
 module Hiroshimarb::Commands
-  class Aa < Hiroshimarb::Command
+  class Asciiart < Hiroshimarb::Command
     def call(*args)
       puts <<EOD
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