dongjoon-hyun commented on a change in pull request #31263:
URL: https://github.com/apache/spark/pull/31263#discussion_r561151318
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File path: docs/README.md
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@@ -39,6 +39,12 @@ installed. Also install the following libraries:
$ sudo gem install jekyll jekyll-redirect-from rouge
```
+If your ruby version is 3.0 or higher, you should install `webrick` too.
Review comment:
Shall we omit `too` here because the other modules are not the same here?
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