diff --git a/2-ui/99-ui-misc/01-mutation-observer/article.md b/2-ui/99-ui-misc/01-mutation-observer/article.md
index a7d19469..bc471bae 100644
--- a/2-ui/99-ui-misc/01-mutation-observer/article.md
+++ b/2-ui/99-ui-misc/01-mutation-observer/article.md
@@ -259,7 +259,7 @@ The mere fact that a DOM node is observed doesn't prevent the garbage collection
 
 ## Summary  
 
-`MutationObserver` can react to changes in DOM: attributes, added/removed elements, text content.
+`MutationObserver` can react to changes in DOM - attributes, text content and adding/removing elements.
 
 We can use it to track changes introduced by other parts of our code, as well as to integrate with third-party scripts.