diff --git a/README.md b/README.md
index d296599..d5c829b 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 78 - 79 = -1
 11 * 25 = 275
 31 / 6 = 5
+80 - 41 = 39