diff --git a/202_Happy_Number.py b/202_Happy_Number.py
index 8436d372..5a0c5856 100644
--- a/202_Happy_Number.py
+++ b/202_Happy_Number.py
@@ -4,9 +4,13 @@ def isHappy(self, n):
         :type n: int
         :rtype: bool
         """
-        # https://en.wikipedia.org/wiki/Happy_number
+        # set to store numbers already seen to detect loops
         seen_numbers = set()
+        # loop continues until n becomes 1 or a loop is found
         while n > 1 and n not in seen_numbers:
+            # store current number to check if it repeats later
             seen_numbers.add(n)
+            # replaces n with the sum of squares of its digits
             n = sum(map(lambda x: int(x) * int(x), list(str(n))))
-        return n == 1
\ No newline at end of file
+        # if n becomes 1, it's a happy number
+        return n == 1