diff --git a/README.md b/README.md
index 1b44324..bee61c6 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 34 - 18 = 16
 73 + 35 = 108
 70 / 10 = 7
+99 - 68 = 31