diff --git a/_posts/en/javascript/2017-03-12-3-array-hacks.md b/_posts/en/javascript/2017-03-12-3-array-hacks.md
index 29279b40..bd946777 100644
--- a/_posts/en/javascript/2017-03-12-3-array-hacks.md
+++ b/_posts/en/javascript/2017-03-12-3-array-hacks.md
@@ -62,11 +62,11 @@ I personally don’t like using `null` since JavaScript treats it as an object a
 > method(...['parameter1', , 'parameter3']); // works!
 ```
 
-### Unique array values
+### 3. Unique array values
 
 I always wonder why the Array constructor does not have a designated method to facilitate the use of unique array values. Spread operators are here for the rescue. Use spread operators with the `Set` constructor to generate unique array values.
 
 ```javascript
 > const arr = [...new Set([1, 2, 3, 3])];
 [1, 2, 3]
-```
\ No newline at end of file
+```