diff --git a/README.md b/README.md
index d07bd56..993f247 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 74 / 2 = 37
 23 * 72 = 1656
 10 / 4 = 2
+57 - 55 = 2