Update automations.rst (#2002)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

guides/automations.rst

@@ -610,6 +610,20 @@ a shorthand way of writing a ``while`` action with an empty ``then`` block.)
           binary_sensor.is_on: some_binary_sensor
       - logger.log: "Binary sensor is ready"
 
+If you want to use a timeout, the term "condition" is required:
+
+.. code-block:: yaml
+
+    # In a trigger:
+    on_...:
+      - logger.log: "Waiting for binary sensor"
+      - wait_until:
+          condition:
+            binary_sensor.is_on: some_binary_sensor
+          timeout: 8s
+      - logger.log: "Binary sensor might be ready"
+
+
 Configuration variables:
 
 - **condition** (**Required**): The condition to wait to become true. See :ref:`Conditions <config-condition>`.