diff --git a/docs/intent_conversation.md b/docs/intent_conversation.md
index f5ddc351..797c8f1d 100644
--- a/docs/intent_conversation.md
+++ b/docs/intent_conversation.md
@@ -4,16 +4,16 @@ title: "Registering sentences"
 
 The conversation component handles incoming commands from the frontend and converts them to intents. It does this based on registered sentences.
 
-As a component, you can register sentences with the conversation component to allow it to be remote controlled. Refer to named slots by putting the slot name between curly braces: `{item}`.
+As a component, you can register sentences with the conversation component to allow it to be remote controlled. Refer to named slots by putting the slot name between curly braces: `{item}`. Use square brackets around (partial) words to mark them as optional.
 
 Example code:
 
 ```python
 async def async_setup(hass, config):
     hass.components.conversation.async_register('MyCoolIntent', [
-        'I think that {object} is very cool',
+        'I think that {object} is [very] cool',
         'Nothing is cooler than {object}'
     ])
 ```
 
-If a sentence like "I think that beer is very cool" comes in, the conversation component will generate an intent of type `MyCoolIntent` and with 1 slot, named `object` and value `beer`.
+If a sentence like "I think that beer is cool" comes in, the conversation component will generate an intent of type `MyCoolIntent` and with 1 slot, named `object` and value `beer`.