improve upgrade guide

dunglas · Sep 16, 2024 · 9e3e172 · 9e3e172
1 parent b58dab9
commit 9e3e172
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diff --git a/docs/UPGRADE.md b/docs/UPGRADE.md
@@ -28,6 +28,8 @@ After:
 }
 ```
 
+[Read the updated specification](../spec/mercure.md#payloads) to learn how to leverage this new feature.
+
 The `MERCURE_TRANSPORT_URL` environment variable and the `transport_url` directive have been deprecated.
 Use the new `transport` directive instead.