diff --git a/src/service/function/service.rs b/src/service/function/service.rs
index 1bcd7a34..5221a9ab 100644
--- a/src/service/function/service.rs
+++ b/src/service/function/service.rs
@@ -11,80 +11,79 @@ use typed_builder::TypedBuilder;
 /// A generic [AppService] to allow creating a service from an async function.
 ///
 /// # Examples
-///
-/// ```rust
-/// # use async_trait::async_trait;
-/// # use clap::Parser;
-/// # use sea_orm_migration::{MigrationTrait, MigratorTrait};
-/// use tokio_util::sync::CancellationToken;
-/// # use roadster::api::cli::RunCommand;
-/// use roadster::app_context::AppContext;
-/// use roadster::error::RoadsterResult;
-/// use roadster::service::function::service::FunctionService;
-/// use roadster::service::registry::ServiceRegistry;
-/// use roadster::app::App as RoadsterApp;
-/// #
-/// # #[derive(Debug, Parser)]
-/// # #[command(version, about)]
-/// # pub struct AppCli {}
-/// #
-/// #
-/// # #[async_trait]
-/// # impl RunCommand<App> for AppCli {
-/// #     #[allow(clippy::disallowed_types)]
-/// #     async fn run(
-/// #         &self,
-/// #         _app: &App,
-/// #         _cli: &AppCli,
-/// #         _context: &AppContext<()>,
-/// #     ) -> RoadsterResult<bool> {
-/// #         Ok(false)
-/// #     }
-/// # }
-/// # pub struct Migrator;
-/// #
-/// # #[async_trait::async_trait]
-/// # impl MigratorTrait for Migrator {
-/// #     fn migrations() -> Vec<Box<dyn MigrationTrait>> {
-/// #         Default::default()
-/// #     }
-/// # }
-///
-/// async fn example_service(
-///     _state: AppContext<()>,
-///     _cancel_token: CancellationToken,
-/// ) -> RoadsterResult<()> {
-///     // Service logic here
-///     Ok(())
-/// }
-///
-/// pub struct App;
-///
-/// #[async_trait]
-/// impl RoadsterApp for App {
-/// #     type State = ();
-/// #     type Cli = AppCli;
-/// #     type M = Migrator;
-/// #
-/// #     async fn with_state(_context: &AppContext) -> RoadsterResult<Self::State> {
-/// #         Ok(())
-/// #     }
-///
-///     async fn services(
-///         registry: &mut ServiceRegistry<Self>,
-///         context: &AppContext<Self::State>,
-///     ) -> RoadsterResult<()> {
-///         let service = FunctionService::builder()
-///             .name("example".to_string())
-///             .enabled(true)
-///             .function(example_service)
-///             .build();
-///         registry.register_service(service)?;
-///         Ok(())
-///     }
-///
-/// }
-/// ```
+#[cfg_attr(
+    feature = "default",
+    doc = r##"
+```rust
+# use async_trait::async_trait;
+# use clap::Parser;
+# use sea_orm_migration::{MigrationTrait, MigratorTrait};
+use tokio_util::sync::CancellationToken;
+# use roadster::api::cli::RunCommand;
+use roadster::app_context::AppContext;
+use roadster::error::RoadsterResult;
+use roadster::service::function::service::FunctionService;
+use roadster::service::registry::ServiceRegistry;
+use roadster::app::App as RoadsterApp;
+#
+# #[derive(Debug, Parser)]
+# #[command(version, about)]
+# pub struct AppCli {}
+#
+#
+# #[async_trait]
+# impl RunCommand<App> for AppCli {
+#     #[allow(clippy::disallowed_types)]
+#     async fn run(
+#         &self,
+#         _app: &App,
+#         _cli: &AppCli,
+#         _context: &AppContext<()>,
+#     ) -> RoadsterResult<bool> {
+#         Ok(false)
+#     }
+# }
+# pub struct Migrator;
+#
+# #[async_trait::async_trait]
+# impl MigratorTrait for Migrator {
+#     fn migrations() -> Vec<Box<dyn MigrationTrait>> {
+#         Default::default()
+#     }
+# }
+async fn example_service(
+    _state: AppContext<()>,
+    _cancel_token: CancellationToken,
+) -> RoadsterResult<()> {
+    // Service logic here
+    Ok(())
+}
+pub struct App;
+#[async_trait]
+impl RoadsterApp for App {
+#     type State = ();
+#     type Cli = AppCli;
+#     type M = Migrator;
+#
+#     async fn with_state(_context: &AppContext) -> RoadsterResult<Self::State> {
+#         Ok(())
+#     }
+    async fn services(
+        registry: &mut ServiceRegistry<Self>,
+        context: &AppContext<Self::State>,
+    ) -> RoadsterResult<()> {
+        let service = FunctionService::builder()
+            .name("example".to_string())
+            .enabled(true)
+            .function(example_service)
+            .build();
+        registry.register_service(service)?;
+        Ok(())
+    }
+}
+```
+"##
+)]
 #[derive(TypedBuilder)]
 pub struct FunctionService<A, F, Fut>
 where