diff --git a/README.md b/README.md
index fe4421b..17dad4e 100644
--- a/README.md
+++ b/README.md
@@ -28,3 +28,4 @@
 58 - 94 = -36
 97 + 43 = 140
 98 - 2 = 96
+99 - 78 = 21