diff --git a/maths/add.rb b/maths/add.rb
index 7351c32..a8a6c35 100644
--- a/maths/add.rb
+++ b/maths/add.rb
@@ -2,7 +2,7 @@
 # Addition or sum of numbers means adding each and every element of the inputs
 # Sum or addition of 1 and 3 is 1 + 3 = 4
 
-def self_add(*array)
+def add(*array)
   sum = 0
   array.each { |a| sum+=a }
   puts "The sum of following elements #{array} is #{sum}"
@@ -10,11 +10,25 @@ def self_add(*array)
     puts "Error: Please provide number only!"
 end
 
+# 
 # Valid inputs
-self_add(1)
-self_add(2, 5, -4)
-self_add(25, 45)
+# 
 
+puts add(1)
+# The sum of following elements [1] is 1
+
+puts add(2, 5, -4)
+# The sum of following elements [2, 5, -4] is 3
+
+puts add(25, 45)
+# The sum of following elements [25, 45] is 70
+
+# 
 # Invalid inputs
-self_add("1", 2, 3)
-self_add("a", 1)
+# 
+
+puts add("1", 2, 3)
+# Error: Please provide number only!
+
+puts add("a", 1)
+# Error: Please provide number only!
diff --git a/maths/average_median.rb b/maths/average_median.rb
index 52f86c2..9e447bd 100644
--- a/maths/average_median.rb
+++ b/maths/average_median.rb
@@ -1,18 +1,18 @@
 # A ruby program to find average median
+# Reference: https://dev.to/colerau/how-to-find-the-median-and-mean-of-an-array-in-ruby-4f04
 
 module AverageMedian
-
   def self.average_median(n, *array)
     if n.instance_of? Integer
       if n == array.size
         array.sort
-        if array.size%2 == 0
+        if array.size % 2 == 0
           mid_element_1 = array.size/2
           mid_element_2 = mid_element_1 + 1
-          puts "The average median of the following elements #{array} is #{(array[mid_element_1-1] + array[mid_element_2-1])/2}."
+          puts "The average median of the following elements #{array} is #{(array[mid_element_1 - 1] + array[mid_element_2 - 1]) / 2}."
         else
-          mid_element = (array.size + 1)/2
-          puts "The average median of the following elements #{array} is #{array[mid_element-1]}."
+          mid_element = (array.size + 1) / 2
+          puts "The average median of the following elements #{array} is #{array[mid_element - 1]}."
         end
       else
         puts "Provide the required #{n} elements properly!"
@@ -25,13 +25,36 @@ module AverageMedian
   end
 end
 
+# 
 # Valid inputs
-AverageMedian.average_median(2, 3, 1)
-AverageMedian.average_median(5, 1, 2, 3, 4, 5)
-AverageMedian.average_median(3, 2, 2, 2)
-AverageMedian.average_median(1, 5)
+# 
 
+puts AverageMedian.average_median(2, 3, 1)
+# The average median of the following elements [3, 1] is 2.
+
+puts AverageMedian.average_median(5, 1, 2, 3, 4, 5)
+# The average median of the following elements [1, 2, 3, 4, 5] is 3.
+
+puts AverageMedian.average_median(3, 2, 2, 2)
+# The average median of the following elements [2, 2, 2] is 2.
+
+puts AverageMedian.average_median(1, 5)
+# The average median of the following elements [5] is 5.
+
+# 
 # Invalid inputs
-AverageMedian.average_median(2, 3, 1, 5)
-AverageMedian.average_median(2, 3, "a")
-AverageMedian.average_median("a", 1, 2)
+# 
+
+puts AverageMedian.average_median(2, 3, 1, 5)
+# Provide the required 2 elements properly!
+
+puts AverageMedian.average_median(2, 3, "a")
+# Traceback (most recent call last):
+#         4: from /Users/voliveira/.rvm/rubies/ruby-2.7.0/bin/irb:23:in `<main>'
+#         3: from /Users/voliveira/.rvm/rubies/ruby-2.7.0/bin/irb:23:in `load'
+#         2: from /Users/voliveira/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/irb-1.2.1/exe/irb:11:in `<top (required)>'
+#         1: from (irb):30
+# NameError (undefined local variable or method `verageMedian' for main:Object)
+
+puts AverageMedian.average_median("a", 1, 2)
+# Error: Please provide number only!