diff --git a/README.md b/README.md
index 1757e9e..35967c3 100644
--- a/README.md
+++ b/README.md
@@ -23,3 +23,4 @@
 29 + 61 = 90
 57 / 7 = 8
 51 / 3 = 17
+15 - 32 = -17