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diff --git a/docs/libraries/auth.md b/docs/libraries/auth.md
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--- a/docs/libraries/auth.md
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@@ -1 +1,98 @@
 # Auth
+
+Library and CLI tool for authentication using [pam](https://github.com/linux-pam/linux-pam).
+
+## Installation
+
+1. install dependencies
+
+:::code-group
+
+```sh [<i class="devicon-archlinux-plain"></i> Arch]
+sudo pacman -Syu meson pam gobject-introspection
+```
+
+```sh [<i class="devicon-fedora-plain"></i> Fedora]
+sudo dnf install meson pam-devel gobject-introspection-devel
+```
+
+```sh [<i class="devicon-ubuntu-plain"></i> Ubuntu]
+# Not yet documented
+```
+
+:::
+
+::: warning On NixOS you have to add `astal-auth` to `security.pam`.
+::: code-group
+
+```nix [configuration.nix]
+{
+  security.pam.services.astal-auth = {}
+}
+```
+
+:::
+
+2. clone repo
+
+```sh
+git clone https://github.com/aylur/astal.git
+cd astal/lib/auth
+```
+
+3. install
+
+```sh
+meson setup build
+meson install -C build
+```
+
+:::tip
+Most distros recommend manual installs in `/usr/local`,
+which is what `meson` defaults to. If you want to install to `/usr`
+instead which most package managers do, set the `prefix` option:
+
+```sh
+meson setup --prefix /usr build
+```
+
+:::
+
+## Usage
+
+You can browse the [Auth reference](https://aylur.github.io/libastal/auth).
+
+### CLI
+
+```sh
+astal-auth --password my-password
+```
+
+### Library
+
+:::code-group
+
+```js [<i class="devicon-javascript-plain"></i> JavaScript]
+import Auth from "gi://AstalAuth";
+import Gio from "gi://Gio";
+
+Gio._promisify(Auth.Pam, "authenticate");
+
+await Auth.Pam.authenticate("password")
+    .then(_ => print("authentication sucessful"))
+    .catch(logError);
+```
+
+```py [<i class="devicon-python-plain"></i> Python]
+# Not yet documented
+```
+
+```lua [<i class="devicon-lua-plain"></i> Lua]
+-- Not yet documented
+```
+
+```vala [<i class="devicon-vala-plain"></i> Vala]
+// Not yet documented
+```
+
+:::