diff --git a/README.md b/README.md
index 90bceed..4bcc0e7 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 93 - 2 = 91
 11 - 48 = -37
 38 + 93 = 131
+10 - 49 = -39