3 files changed, 13 insertions, 2 deletions
diff --git a/lib/json/add/complex.rb b/lib/json/add/complex.rb
index d7ebebf..2723f60 100644
--- a/lib/json/add/complex.rb
+++ b/lib/json/add/complex.rb
@@ -4,10 +4,15 @@ end
 defined?(::Complex) or require 'complex'
 
 class Complex
+
+  # Deserializes JSON string by converting Real value <tt>r</tt>, imaginary
+  # value <tt>i</tt>, to a Complex object.
   def self.json_create(object)
     Complex(object['r'], object['i'])
   end
 
+  # Returns a hash, that will be turned into a JSON object and represent this
+  # object.
   def as_json(*)
     {
       JSON.create_id => self.class.name,
@@ -16,7 +21,8 @@ class Complex
     }
   end
 
+  # Stores class name (Complex) along with real value <tt>r</tt> and imaginary value <tt>i</tt> as JSON string
   def to_json(*)
     as_json.to_json
   end
-end
+end
+\ No newline at end of file
diff --git a/lib/json/add/rational.rb b/lib/json/add/rational.rb
index 867cd92..ee39c20 100644
--- a/lib/json/add/rational.rb
+++ b/lib/json/add/rational.rb
@@ -4,10 +4,14 @@ end
 defined?(::Rational) or require 'rational'
 
 class Rational
+  # Deserializes JSON string by converting numerator value <tt>n</tt>,
+  # denominator value <tt>d</tt>, to a Rational object.
   def self.json_create(object)
     Rational(object['n'], object['d'])
   end
 
+  # Returns a hash, that will be turned into a JSON object and represent this
+  # object.
   def as_json(*)
     {
       JSON.create_id => self.class.name,
@@ -16,6 +20,7 @@ class Rational
     }
   end
 
+  # Stores class name (Rational) along with numerator value <tt>n</tt> and denominator value <tt>d</tt> as JSON string
   def to_json(*)
     as_json.to_json
   end
diff --git a/lib/json/add/time.rb b/lib/json/add/time.rb
index 338209d..d983467 100644
--- a/lib/json/add/time.rb
+++ b/lib/json/add/time.rb
@@ -10,7 +10,7 @@ class Time
     if usec = object.delete('u') # used to be tv_usec -> tv_nsec
       object['n'] = usec * 1000
     end
-    if instance_methods.include?(:tv_nsec)
+    if method_defined?(:tv_nsec)
       at(object['s'], Rational(object['n'], 1000))
     else
       at(object['s'], object['n'] / 1000)