diff --git a/README.md b/README.md
index 129c30b..5fcce35 100644
--- a/README.md
+++ b/README.md
@@ -9,3 +9,4 @@
 36 / 2 = 18
 6 / 5 = 1
 78 + 23 = 101
+72 - 30 = 42