diff --git a/README.md b/README.md
index 6f50f9a..e5e9d22 100644
--- a/README.md
+++ b/README.md
@@ -23,3 +23,4 @@
 7 / 8 = 0
 12 - 7 = 5
 50 + 88 = 138
+6 - 19 = -13