README.md: explain externModules

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Timothy DeHerrera 2020-12-28 15:31:17 -07:00
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@ -90,6 +90,6 @@ flake output `overlays` as well.
If you wish to use an overlay from an external flake, simply add it to the
`externOverlays` list in the `let` block of the `outputs` attribute in
[flake.nix](flake.nix).
[flake.nix](flake.nix). Same for external modules, add them to `externModules`.
[home-manager]: https://github.com/rycee/home-manager