diff --git a/.changeset/thirty-bees-check.md b/.changeset/thirty-bees-check.md
new file mode 100644
index 000000000000..f7e2703dea9c
--- /dev/null
+++ b/.changeset/thirty-bees-check.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/vercel': patch
+---
+
+Add warning when `functionPerRoute` is set to `true`
diff --git a/packages/integrations/vercel/src/serverless/adapter.ts b/packages/integrations/vercel/src/serverless/adapter.ts
index 22c35b87f63a..87308ce2f052 100644
--- a/packages/integrations/vercel/src/serverless/adapter.ts
+++ b/packages/integrations/vercel/src/serverless/adapter.ts
@@ -129,7 +129,12 @@ export default function vercelServerless({
 					...getImageConfig(imageService, imagesConfig, command),
 				});
 			},
-			'astro:config:done': ({ setAdapter, config }) => {
+			'astro:config:done': ({ setAdapter, config, logger }) => {
+				if (functionPerRoute === true) {
+					logger.warn(
+						"The Vercel plans might have limits to the number of functions you can create, make sure to check them if you don't want to incur into additional costs."
+					);
+				}
 				setAdapter(getAdapter({ functionPerRoute, edgeMiddleware }));
 				_config = config;
 				buildTempFolder = config.build.server;