diff --git a/README.md b/README.md
index 437eb52..e869a4b 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 5 / 8 = 0
 94 + 71 = 165
 10 / 8 = 1
+87 - 99 = -12