diff --git a/examples/oapi-generics/src/main.rs b/examples/oapi-generics/src/main.rs
index 0b0a43a0f..75f52a6c6 100644
--- a/examples/oapi-generics/src/main.rs
+++ b/examples/oapi-generics/src/main.rs
@@ -7,14 +7,19 @@ struct MyObject<T: ToSchema + std::fmt::Debug + 'static> {
     value: T,
 }
 
+/// Use string type, this will add to openapi doc.
 #[endpoint]
 async fn use_string(body: JsonBody<MyObject<String>>) -> String {
     format!("{:?}", body)
 }
+
+/// Use i32 type, this will add to openapi doc.
 #[endpoint]
 async fn use_i32(body: JsonBody<MyObject<i32>>) -> String {
     format!("{:?}", body)
 }
+
+/// Use u64 type, this will add to openapi doc.
 #[endpoint]
 async fn use_u64(body: JsonBody<MyObject<u64>>) -> String {
     format!("{:?}", body)