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docs/fingerprint.md

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+# Fingerprint Commands
+
+This note covers the basic `fprintd` commands used by the fingerprint module.
+
+## Enroll a new fingerprint
+
+Register a fingerprint for the current user:
+
+```sh
+fprintd-enroll $USER
+```
+
+To enroll a specific finger, pass the finger name:
+
+```sh
+fprintd-enroll -f right-index-finger $USER
+```
+
+Common finger names include:
+
+- `left-thumb`
+- `left-index-finger`
+- `right-thumb`
+- `right-index-finger`
+
+Follow the prompts and swipe or touch the sensor until enrollment completes.
+
+## List enrolled fingerprints
+
+Show fingerprints registered for the current user:
+
+```sh
+fprintd-list $USER
+```
+
+You can also list fingerprints for another user:
+
+```sh
+fprintd-list <username>
+```
+
+## Delete fingerprints
+
+Delete one enrolled fingerprint for the current user:
+
+```sh
+fprintd-delete
+```
+
+Delete all enrolled fingerprints for the current user:
+
+```sh
+fprintd-delete $USER
+```
+
+Delete fingerprints for another user:
+
+```sh
+fprintd-delete <username>
+```
+
+## Verify authentication
+
+Test fingerprint authentication for the current user:
+
+```sh
+fprintd-verify
+```