diff --git a/0_basics/README.md b/0_basics/README.md
index b6d339d..af384f6 100644
--- a/0_basics/README.md
+++ b/0_basics/README.md
@@ -274,6 +274,7 @@ Additional:
 
 #### 10.3. What is the benefit of using it?
 > ?
+</details>
 
 
 <details>