diff --git a/README.md b/README.md
index 11015ec..7a82ae1 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 63 - 24 = 39
 91 * 51 = 4641
 29 + 42 = 71
+39 - 24 = 15