diff --git a/README.md b/README.md
index f4c6449..183b2d5 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 95 / 6 = 15
 2 - 29 = -27
 26 / 3 = 8
+78 - 79 = -1