diff --git a/1-js/09-classes/06-instanceof/article.md b/1-js/09-classes/06-instanceof/article.md
index 92424bcc..78146572 100644
--- a/1-js/09-classes/06-instanceof/article.md
+++ b/1-js/09-classes/06-instanceof/article.md
@@ -66,7 +66,7 @@ The algorithm of `obj instanceof Class` works roughly as follows:
     alert(obj instanceof Animal); // true: Animal[Symbol.hasInstance](obj) is called
     ```
 
-2. Most classes do not have `Symbol.hasInstance`. In that case, the standard logic is used: `obj instanceOf Classs` checks whether `Class.prototype` equals to one of prototypes in the `obj` prototype chain.
+2. Most classes do not have `Symbol.hasInstance`. In that case, the standard logic is used: `obj instanceOf Class` checks whether `Class.prototype` equals to one of prototypes in the `obj` prototype chain.
 
     In other words, compare:
     ```js