diff --git a/packages/zod-openapi/README.md b/packages/zod-openapi/README.md
index dd079c9b..6a222723 100644
--- a/packages/zod-openapi/README.md
+++ b/packages/zod-openapi/README.md
@@ -44,7 +44,7 @@ const ParamsSchema = z.object({
 const UserSchema = z
   .object({
     id: z.string().openapi({
-      example: 123,
+      example: '123',
     }),
     name: z.string().openapi({
       example: 'John Doe',