diff --git a/README.md b/README.md
index bad3994..6dec3dd 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 79 * 6 = 474
 76 * 13 = 988
 3 / 9 = 0
+13 - 88 = -75