diff --git a/algorithms/math/fibonacci.py b/algorithms/math/fibonacci.py
index 4420883..2324c69 100644
--- a/algorithms/math/fibonacci.py
+++ b/algorithms/math/fibonacci.py
@@ -1,11 +1,24 @@
-def fibonacciUn(Un_2,Un_1,n):
+'''
+In mathematics, the Fibonacci numbers, commonly denoted Fn , form a sequence, the Fibonacci sequence, in which each number is the sum of the two preceding ones. Like for example first two terms of a sequence are 0 and 1. Now its fibonacci sequence will be as follows.
+
+0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144.
+'''
+
+def fibonacciUn(Un_2,Un_1,n: int):
+    '''
+    This function gives two more terms 
+    of the fibonacci sequence after 
+    given two terms.
+    '''
     if(n<1):
         return Un_2
     if (n==1):
         return Un_1
     for i in range(n):
         fib=Un_1+Un_2
+        print(fib)
         Un_2=Un_1
         Un_1=fib
     return Un_1
-print(fibonacciUn(10,15,2))
\ No newline at end of file
+
+fibonacciUn(10,15,2)
\ No newline at end of file