diff --git a/README.md b/README.md
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--- a/README.md
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@@ -4,10 +4,6 @@ Notify slack from the command line. It receives standard input and notifies Slac
 
 Please watch this video. https://www.youtube.com/watch?v=wmKSr9Aoz-Y
 
-I wrote this article on Notion in Japanese.
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-[How to use notify_slack](https://www.notion.so/How-to-use-notify_slack-fd82abd3d62a46fa88700a62d97903c8)
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 ## Installation
 
 I recommend you to use the binaries on [GitHub Releases](https://github.com/catatsuy/notify_slack/releases). Please download the latest version and use it.