diff --git a/readme/ko.md b/readme/ko.md
index be539785..15ad032c 100644
--- a/readme/ko.md
+++ b/readme/ko.md
@@ -89,6 +89,7 @@
 
 **추가 정보**
 * [Myth Catalog](../subfiles/myth_catalog.md)
+* [How many % of top 1,000 most visited sites(2010) are using Cloudflare today?](../subfiles/google_ad_planner_top_1000_sites.md)
 * [The Great Cloudwall](../pdf/2019-Jeff_Cliff_Book1.txt), [Mr. Jeff Cliff](https://shitposter.club/users/jeffcliff)
   * 다운로드: [PDF](../pdf/2019-The_Great_Cloudwall.pdf), [ePUB](../pdf/2019-Jeff_Cliff_The_Great_Cloudwall.epub)
   * CC0 자료의 저작권 침해로 인해 BookRix GmbH가 원본 eBook (ePUB)을 삭제했습니다.