diff --git a/2-ui/1-document/09-size-and-scroll/article.md b/2-ui/1-document/09-size-and-scroll/article.md
index 7b2adb25..da02abdc 100644
--- a/2-ui/1-document/09-size-and-scroll/article.md
+++ b/2-ui/1-document/09-size-and-scroll/article.md
@@ -60,7 +60,7 @@ These properties are rarely needed, but still they are the "most outer" geometry
The `offsetParent` is the nearest ancestor that is:
-1. CSS-positioned (`position` is `absolute`, `relative` or `fixed`),
+1. CSS-positioned (`position` is `absolute`, `relative`, `fixed` or `sticky`),
2. or `| `, ` | `, ` |