diff --git a/.changeset/lovely-elephants-peel.md b/.changeset/lovely-elephants-peel.md
new file mode 100644
index 0000000000..7dfe25b9cb
--- /dev/null
+++ b/.changeset/lovely-elephants-peel.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Remove redundant comments when `astro add` update `astro.config.mjs`
diff --git a/packages/astro/src/core/add/index.ts b/packages/astro/src/core/add/index.ts
index d90075ce78..3abe00db97 100644
--- a/packages/astro/src/core/add/index.ts
+++ b/packages/astro/src/core/add/index.ts
@@ -507,7 +507,7 @@ async function updateAstroConfig({
 	let output = await generate(ast);
 	const comment = '// https://astro.build/config';
 	const defaultExport = 'export default defineConfig';
-	output = output.replace(` ${comment}`, '');
+	output = output.replace(`\n${comment}`, '');
 	output = output.replace(`${defaultExport}`, `\n${comment}\n${defaultExport}`);
 
 	if (input === output) {