diff --git a/2-ui/1-document/05-basic-dom-node-properties/4-where-document-in-hierarchy/task.md b/2-ui/1-document/05-basic-dom-node-properties/4-where-document-in-hierarchy/task.md
index d83602dc..de266c6a 100644
--- a/2-ui/1-document/05-basic-dom-node-properties/4-where-document-in-hierarchy/task.md
+++ b/2-ui/1-document/05-basic-dom-node-properties/4-where-document-in-hierarchy/task.md
@@ -4,7 +4,7 @@ importance: 4
 
 # Where's the "document" in the hierarchy?
 
-Which class the `document` belongs to?
+Which class does the `document` belong to?
 
 What's its place in the DOM hierarchy?