diff --git a/README.md b/README.md
index c5a85f7..b2efa58 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 88 + 19 = 107
 29 * 77 = 2233
 88 / 10 = 8
+4 - 51 = -47