docs: Mention du requirement

groupon · Apr 8, 2016 · 7fd0b93 · 7fd0b93
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 # ndu - Visualize your Node app's disk space usage
 
-**Requires node 4 or later.**
+**Requires node 4+ and `du`. Windows not yet supported.**
 
 `ndu` is a tool for analyzing the size of dependencies in a node.js application.
 It's similar to [`disc`](https://npmjs.com/disc), but for server-side