diff --git a/algorithms/math/lcm.py b/algorithms/math/lcm.py
index 35f1c77..e84c2ae 100644
--- a/algorithms/math/lcm.py
+++ b/algorithms/math/lcm.py
@@ -1,3 +1,4 @@
+# calculate gcd also, gcd(a,b)*lcm(a,b) = a*b
 def lcm(a, b):
     """
     Simple version of lcm, that does not have any dependencies