diff --git a/README.md b/README.md
index 1575803..e311920 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 6 + 15 = 21
 15 * 100 = 1500
 17 * 41 = 697
+66 - 88 = -22