diff --git a/docs/frontend/custom-ui/custom-card.md b/docs/frontend/custom-ui/custom-card.md
index 841bda26..bca28f2a 100644
--- a/docs/frontend/custom-ui/custom-card.md
+++ b/docs/frontend/custom-ui/custom-card.md
@@ -78,7 +78,7 @@ Custom cards are defined as a [custom element](https://developer.mozilla.org/en-
 
 Home Assistant will call `setConfig(config)` when the configuration changes (rare). If you throw an exception if the configuration is invalid, Home Assistant will render an error card to notify the user.
 
-Home Assistant will set the `hass` property when the state of Home Assistant changes (frequent). Whenever the state changes, the component will have to update itself to represent the latest state.
+Home Assistant will set [the `hass` property](/docs/frontend/data/) when the state of Home Assistant changes (frequent). Whenever the state changes, the component will have to update itself to represent the latest state.
 
 Your card can define a `getCardSize` method that returns the size of your card as a number or a promise that will resolve to a number. A height of 1 is equivalent to 50 pixels. This will help Home Assistant distribute the cards evenly over the columns. A card size of `1` will be assumed if the method is not defined.