diff --git a/README.md b/README.md
index 59d12ed..e18dd87 100644
--- a/README.md
+++ b/README.md
@@ -42,3 +42,4 @@
 70 / 3 = 23
 42 - 38 = 4
 20 * 12 = 240
+30 - 41 = -11