readme fixes

README.md

@@ -5,13 +5,13 @@ Rubinius 1.2.2.
 
 activepesel is available as a gem. In your Gemfile add
 
-```ruby
+```
 gem 'activepesel'
 ```
 
 #In your model:
 
-```ruby
+```
 
 class User < ActiveRecord::Base
   attr_accessible :dads_pesel, :mums_pesel
@@ -31,17 +31,28 @@ end
 
 # Activepesel::PersonalData object
 
-When using ```rubyattr_pesel :name_of_attr``` in your model you will get new instance method available: ```rubyname_of_attr_personal_data```.
+When using ```attr_pesel :name_of_attr``` in your model you will get new instance method available: ```rubyname_of_attr_personal_data```.
 
 The method returns ```rubyActivepesel::PersonalData``` object which has the following attributes:
 
-```ruby
+```
 date_of_birth:Date
 sex:Integer
 ```
 
-Sex attribute can take 3 values. 1 - for men, 2 - for women, 9 - unknown ([ISO/IEC 5218](http://en.wikipedia.org/wiki/ISO/IEC_5218))
+Sex attribute can take 3 values. 1 - for men, 2 - for women, 9 - not applicable ([ISO/IEC 5218](http://en.wikipedia.org/wiki/ISO/IEC_5218))
+
+For the invalid PESEL numbers the ```date_of_birth``` attribute is set to ```nil``` and the ```sex``` is 9 - not applicable.
 
+# Using Activepesel outside ActiveModel / ActiveRecord models.
+
+You can use it like in the given example
+
+```
+pesel = Activepesel::Pesel.new("82060202039")
+pesel.valid? => true
+pesel.get_personal_data => Activepesel::PersonalData(...)
+```