diff --git a/README.md b/README.md
index 84513fc..1b29a33 100644
--- a/README.md
+++ b/README.md
@@ -25,3 +25,4 @@
 51 / 3 = 17
 15 - 32 = -17
 97 - 61 = 36
+30 - 80 = -50