diff --git a/README.md b/README.md
index a363b09..c75e696 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 31 / 2 = 15
 69 * 71 = 4899
 54 - 79 = -25
+26 - 39 = -13