diff --git a/README.md b/README.md
index 93843fe..b002d56 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 88 - 25 = 63
 70 - 56 = 14
 57 * 13 = 741
+20 - 49 = -29