diff --git a/.changeset/thin-kangaroos-appear.md b/.changeset/thin-kangaroos-appear.md
new file mode 100644
index 0000000000..c1019c3266
--- /dev/null
+++ b/.changeset/thin-kangaroos-appear.md
@@ -0,0 +1,5 @@
+---
+"marko": patch
+---
+
+Update documentation
diff --git a/packages/marko/docs/rendering.md b/packages/marko/docs/rendering.md
index e830c92f41..40ef1777d9 100644
--- a/packages/marko/docs/rendering.md
+++ b/packages/marko/docs/rendering.md
@@ -263,4 +263,6 @@ app.get("/", (req, res) => {
 });
 ```
 
+> **Warning:** Ensure that you serialize only data which is necessary for the browser. Serialization is expensive for both server rendering performance and HTML output size.
+
 For details, check [#672: “Serialize only input and state on top-level server-rendered UI components”](https://github.com/marko-js/marko/pull/672).