1 files changed, 23 insertions, 0 deletions
diff --git a/lib/nil_person.rb b/lib/nil_person.rb
index 30a175f..607ae77 100644
--- a/lib/nil_person.rb
+++ b/lib/nil_person.rb
@@ -1,26 +1,49 @@
 # frozen_string_literal: true
 
+# NilPerson class following the NullObject pattern.
+# This class represents a null object for a person, providing default
+# implementations that return nil or self as appropriate.
 class NilPerson
+  # Returns the name of the NilPerson.
+  #
+  # @return [nil] Always returns nil.
   def name
     nil
   end
 
+  # Returns the father of the NilPerson.
+  #
+  # @return [NilPerson] Always returns self.
   def father
     self
   end
 
+  # Returns the mother of the NilPerson.
+  #
+  # @return [NilPerson] Always returns self.
   def mother
     self
   end
 
+  # Returns the gender of the NilPerson.
+  #
+  # @return [nil] Always returns nil.
   def gender
     nil
   end
 
+  # Checks equality with another object.
+  #
+  # @param other [Object] The object to compare with.
+  # @return [Boolean] True if the other object is a NilPerson, false otherwise.
   def ==(other)
     other.is_a?(NilPerson)
   end
 
+  # Checks equality with another object (alias for ==).
+  #
+  # @param other [Object] The object to compare with.
+  # @return [Boolean] True if the other object is a NilPerson, false otherwise.
   def eql?(other)
     self == other
   end