diff --git a/1-js/09-classes/05-extend-natives/article.md b/1-js/09-classes/05-extend-natives/article.md
index 9a568673..28b4c6eb 100644
--- a/1-js/09-classes/05-extend-natives/article.md
+++ b/1-js/09-classes/05-extend-natives/article.md
@@ -32,7 +32,7 @@ When `arr.filter()` is called, it internally creates the new array of results us
 
 Even more, we can customize that behavior.
 
-We can add a special static getter `Symbol.species` to the class. If exists, it should return the constructor that JavaScript will use internally to create new entities in `map`, `filter` and so on.
+We can add a special static getter `Symbol.species` to the class. If it exists, it should return the constructor that JavaScript will use internally to create new entities in `map`, `filter` and so on.
 
 If we'd like built-in methods like `map` or `filter` to return regular arrays, we can return `Array` in `Symbol.species`, like here: