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This plugin allows ikiwiki to process `.otl` outline files, as created by
-[vimoutliner](http://www.vimoutliner.org/). To use it, you need to have
+[vimoutliner](https://github.com/vimoutliner/vimoutliner). To use it, you need to have
vimoutliner installed, since it uses the `otl2html` program.