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+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+.. _mod-etcd:
+
+Etcd support
+------------
+
+The `etcd` module connects to `etcd <https://etcd.io/>`_ peers and watches
+for configuration changes. By default, the module watches the subtree under
+``/knot-resolver`` directory, but you can change this in the
+`etcd library configuration <https://github.com/mah0x211/lua-etcd#cli-err--etcdnew-optiontable->`_.
+
+The subtree structure corresponds to the configuration variables in the declarative style.
+
+.. code-block:: bash
+
+	$ etcdctl set /knot-resolver/net/127.0.0.1 53
+	$ etcdctl set /knot-resolver/cache/size 10000000
+
+Configures all listening nodes to following configuration:
+
+.. code-block:: lua
+
+	net = { '127.0.0.1' }
+	cache.size = 10000000
+
+Example configuration
+^^^^^^^^^^^^^^^^^^^^^
+
+.. code-block:: lua
+
+	modules.load('etcd')
+        etcd.config({
+                prefix = '/knot-resolver',
+                peer = 'http://127.0.0.1:7001'
+        })
+
+.. warning:: Work in progress!
+
+Dependencies
+^^^^^^^^^^^^
+
+* `lua-etcd <https://github.com/mah0x211/lua-etcd>`_ library available in LuaRocks
+
+    ``$ luarocks --lua-version 5.1 install etcd --from=https://mah0x211.github.io/rocks/``
+