diff --git a/README.md b/README.md
index 3df13b9..a5c0e77 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 3 / 9 = 0
 13 - 88 = -75
 36 / 1 = 36
+20 - 17 = 3