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# Overlays
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Writing overlays is a common occurence when using a NixOS system. Therefore,
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we want to keep the process as simple and straightforward as possible.
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Any _.nix_ files declared in this directory will be assumed to be a valid
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overlay, and will be automatically imported into all [hosts](../concepts/hosts.md), and
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exported via `overlays.<file-basename>` _as well as_
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`packages.<system>.<pkgName>` (for valid systems), so all you have to do is
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write it.
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## Example
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overlays/kakoune.nix:
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```nix
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final: prev: {
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kakoune = prev.kakoune.override {
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configure.plugins = with final.kakounePlugins; [
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(kak-fzf.override { fzf = final.skim; })
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kak-auto-pairs
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kak-buffers
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kak-powerline
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kak-vertical-selection
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];
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};
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}
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```
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