diff --git a/README.md b/README.md
index 3e47c20..8fa85e9 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 37 / 6 = 6
 31 - 99 = -68
 57 / 4 = 14
+64 - 61 = 3