Mention tool called "prelude"

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--- a/doc/index.org
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@@ -390,6 +390,7 @@ CLI mail directory using normal text editor. Once AI assignment is
 ready for processing, you should [[id:883d6e7c-60e0-422b-8c00-5cdc9dfec20d][initiate AI processing]] on that file.
 
 ** "joinfiles" command
+*Note:* See also alternative solution with similar goal: [[https://github.com/aerugo/prelude][prelude]].
 
 The *joinfiles* command is a utility for aggregating the contents of
 multiple files into a single document, which can then be processed by