diff --git a/README.md b/README.md
index 23f2a2e..269a1b4 100644
--- a/README.md
+++ b/README.md
@@ -12,3 +12,4 @@
 72 - 30 = 42
 46 * 21 = 966
 87 + 68 = 155
+100 - 21 = 79