fix doc

.gitignore

@@ -32,4 +32,5 @@ doc/
 *.lock
 *.bak
 tool/
-*\#*
+*\#*
+.rbx/

README.md

@@ -41,7 +41,7 @@ require 'integer/base/core_ext'
 '10'.to_i [*'0'..'9', *'A'..'Z']                    #=> 36
 '10'.to_i 37                                        #=> ArgumentError
 '10'.to_i [*'0'..'9', *'A'..'Z', '?']               #=> 37
-'1?'.to_s [*'0'..'9', *'A'..'Z', '?']               #=> '73' (37 * 1 + 36 * 1)
+'1?'.to_i [*'0'..'9', *'A'..'Z', '?']               #=> 73 (37 * 1 + 36 * 1)
 ```
 
 ### Let's begin, your strange base number.

integer-base.gemspec

@@ -3,7 +3,8 @@ require File.expand_path('../lib/integer/base/version', __FILE__)
 Gem::Specification.new do |gem|
   gem.authors       = ['Kenichi Kamiya']
   gem.email         = ['kachick1+ruby@gmail.com']
-  gem.description   = %q{Any formats can mean positional/unary numeral systems :)}
+  gem.description   = %q{Any formats can mean positional/unary numeral systems :)
+So base number conversion under your choise.}
   gem.summary       = %q{Any formats can mean positional/unary numeral systems :)}
   gem.homepage      = 'https://github.com/kachick/integer-base'