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 024e9a4d..13e245eb 100644
--- a/2-ui/1-document/09-size-and-scroll/article.md
+++ b/2-ui/1-document/09-size-and-scroll/article.md
@@ -211,7 +211,7 @@ If you click the element below, the code `elem.scrollTop += 10` executes. That m
 <div onclick="this.scrollTop+=10" style="cursor:pointer;border:1px solid black;width:100px;height:80px;overflow:auto">Click<br>Me<br>1<br>2<br>3<br>4<br>5<br>6<br>7<br>8<br>9</div>
 ```
 
-Setting `scrollTop` to `0` or `Infinity` will make the element scroll to the very top/bottom respectively.
+Setting `scrollTop` to `0` or a big value, such as `1e9` will make the element scroll to the very top/bottom respectively.
 ````
 
 ## Don't take width/height from CSS