From f8ccb4c747bf390f7f6d3bce3a031d84c60a1c10 Mon Sep 17 00:00:00 2001
From: Racoonicorn <Racoonicorn@users.noreply.github.com>
Date: Wed, 14 Dec 2016 21:17:55 +0100
Subject: [PATCH] Update README.md

---
 README.md | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 7c7a4d6..442e995 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,9 @@
-# Arithmetic-Derivative
\ No newline at end of file
+# Arithmetic Derivative
+
+Arithmetic derivative calculator using this simple formulas:
+* 0' = 1' = 0;
+* if n is a prime, n' = 1;
+* if n = ab  (a and b > 1), n' = a'b + ab'
+
+More about arithmetic derivative:
+https://en.wikipedia.org/wiki/Arithmetic_derivative