diff --git a/README.md b/README.md
index b2fdb41..f9746e8 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 94 + 20 = 114
 65 + 5 = 70
 95 + 29 = 124
+81 - 85 = -4