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+This directory contains various NixOS modules.
+
+If you add a module here, make sure that you define all options using a
+`vuizvui.*` namespace, so that the documentation is generated and you don't
+clash with modules from upstream [nixpkgs](https://github.com/NixOS/nixpkgs).
+
+For writing modules, make sure to categorize them accordingly:
+
+<table>
+  <tr>
+    <th>profiles</th>
+    <td>Options for a specific domain (like for example
+        `desktop`, `router`, `music`, ...)
+    </td>
+  </tr>
+  <tr>
+    <th>programs</th>
+    <td>Program-specific configuration options</td>
+  </tr>
+  <tr>
+    <th>services</th>
+    <td>Modules that implement systemd services</td>
+  </tr>
+  <tr>
+    <th>tasks</th>
+    <td>Various one-shot services</td>
+  </tr>
+</table>
+
+If a module is highly specific for your own configuration, use the same
+categories but put them under `user/$category/$module`.
+
+Don't forget to add your module to the list module-list.nix, but make sure you
+have options in place to disable them by default.