README.md in petrarca-0.4.14 vs README.md in petrarca-0.5.0

@@ -10,11 +10,11 @@
 All functions support both ISBN-13 and ISBN-10.
 
 All ranges of registration groups and registrants are supported.
 Those depends on 'RangeMessage.xml' file, downloaded from [International ISBN Agency](https://www.isbn-international.org/range_file_generation).
 
-NOTE: Updated range files to latest version on April 2, 2022.
+NOTE: Updated range files to latest version on May 4, 2022.
 
 ## Installation
 
 Add this line to your application's Gemfile:
 
@@ -42,9 +42,31 @@
     => "4-8156-0644-7"
     irb(main):005:0> Petrarca.to_13("4-8156-0644-7")
     => "978-4-8156-0644-2"
     irb(main):006:0> Petrarca.hyphenate("9784815606442")
     => "978-4-8156-0644-2"
+
+SINCE v0.5.0
+
+Accept Integer as ISBN, only if no `-` and `X` including.
+
+    irb(main):001:0> require 'petrarca'
+    => true
+    irb(main):002:0> Petrarca.calc_check_digit(978481560644)
+    => "2"
+    irb(main):003:0> Petrarca.to_10(9784815606442)
+    => "4-8156-0644-7"
+    irb(main):004:0> Petrarca.to_13(4815606447)
+    => "978-4-8156-0644-2"
+    irb(main):005:0> Petrarca.hyphenate(9784815606442)
+    => "978-4-8156-0644-2"
+
+If the ISBN is hyphenated, consider registration group and registrant in `Petrarca.valid?`. The second example below has the invalid registrant.
+
+    irb(main):006:0> Petrarca.valid?("978-4-8156-0644-2")
+    => true
+    irb(main):007:0> Petrarca.valid?("978-4-815-60644-2")
+    => false
 
 ## License
 
 MIT License