diff --git a/dynamic_programming/factorial.py b/dynamic_programming/factorial.py
index 1c9c927f5af3..c01d4f9e4557 100644
--- a/dynamic_programming/factorial.py
+++ b/dynamic_programming/factorial.py
@@ -1,4 +1,16 @@
+#Factorial is the product of all positive integers less than or equal to a given positive integer 
+#and denoted by that integer and an exclamation point. 
+#For example, factorial seven is written 7!, meaning 1 × 2 × 3 × 4 × 5 × 6 × 7. 
+#Factorial zero is defined as equal to 1.
+
 # Factorial of a number using memoization
+#If n = 0, return 1
+#Otherwise if n is in the memo, return the memo's value for n
+#Otherwise,
+#Calculate (n - 1)! x n
+#Store result in the memo
+#Return result
+
 
 from functools import lru_cache