diff --git a/packages/lit-dev-content/site/docs/v3/data/signals.md b/packages/lit-dev-content/site/docs/v3/data/signals.md
index 5b0bc616b..c8c9756c9 100644
--- a/packages/lit-dev-content/site/docs/v3/data/signals.md
+++ b/packages/lit-dev-content/site/docs/v3/data/signals.md
@@ -172,7 +172,7 @@ all update when the value changes.
 -->
 
 ```ts
-import {LitElement, html} from 'lit';
+import {LitElement, html, css} from 'lit';
 import {customElement} from 'lit/decorators.js';
 import {SignalWatcher, signal} from '@lit-labs/signals';