diff --git a/crates/eframe/src/native/epi_integration.rs b/crates/eframe/src/native/epi_integration.rs
index 8d66a500c..d38d074cb 100644
--- a/crates/eframe/src/native/epi_integration.rs
+++ b/crates/eframe/src/native/epi_integration.rs
@@ -495,7 +495,7 @@ impl EpiIntegration {
 
     /// Run user code - this can create immediate viewports, so hold no locks over this!
     ///
-    /// If `viewport_ui_cb` is None, we are in the root viewport and will call [`App::update`].
+    /// If `viewport_ui_cb` is None, we are in the root viewport and will call [`crate::App::update`].
     pub fn update(
         &mut self,
         app: &mut dyn epi::App,
diff --git a/crates/eframe/src/native/run.rs b/crates/eframe/src/native/run.rs
index 2cf776d3c..3b5e5bb7c 100644
--- a/crates/eframe/src/native/run.rs
+++ b/crates/eframe/src/native/run.rs
@@ -507,13 +507,14 @@ mod glow_integration {
             crate::profile_scope!("frame");
 
             {
-                // This will only happen if the viewport is sync
-                // That means that the viewport cannot be rendered by itself and needs his parent to be rendered
                 let glutin = self.glutin.borrow();
                 let viewport = &glutin.viewports[&viewport_id];
-                if viewport.viewport_ui_cb.is_none() && viewport_id != ViewportId::ROOT {
+                let is_immediate = viewport.viewport_ui_cb.is_none();
+                if is_immediate && viewport_id != ViewportId::ROOT {
                     if let Some(parent_viewport) = glutin.viewports.get(&viewport.id_pair.parent) {
                         if let Some(window) = parent_viewport.window.as_ref() {
+                            // This will only happen if this is an immediate viewport.
+                            // That means that the viewport cannot be rendered by itself and needs his parent to be rendered.
                             return EventResult::RepaintNext(window.id());
                         }
                     }
@@ -701,6 +702,7 @@ mod glow_integration {
         id_pair: ViewportIdPair,
 
         /// The user-callback that shows the ui.
+        /// None for immediate viewports.
         viewport_ui_cb: Option<Arc<ViewportUiCallback>>,
 
         egui_winit: Option<egui_winit::State>,