diff --git a/README.md b/README.md
index df74926..e8e30be 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 15 * 100 = 1500
 17 * 41 = 697
 66 - 88 = -22
+100 - 100 = 0