diff --git a/README.md b/README.md
index 72d3124..d09515d 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,9 @@
 # 🦀 Learning rust-[book](doc.rust-lang.ru/book) 🦀
 
-<dt>
-    <summ>M</summ>
+<details>
+    <summary>M</summary>
     test 
-</dt>
+</details>
 
 
 ---