diff --git a/Patterns/factorial.py b/Patterns/factorial.py
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+++ b/Patterns/factorial.py
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+"""
+Script containing basic factorial algorithm.
+
+Function uses recursion to find factorial of n.
+Given a function f(n) that returns the factorial of a number:
+Base case: f(0) = 1 and f(1) = 1
+Recursive case: if n > 1, then f(n) = f(n-1)*n
+
+For further reading: http://www.purplemath.com/modules/factorial.htm
+https://www.khanacademy.org/computing/computer-science/algorithms/recursive-algorithms/a/recursive-factorial
+Advanced: https://en.wikipedia.org/wiki/Factorial
+"""
+
+
+def nfactorial(n):
+    n = int(n)
+    if n == 0 or n == 1:
+        return 1
+    if n > 1:
+        return nfactorial(n - 1) * n
+
+
+n = input('Give n ---> ')
+print(nfactorial(n))