diff --git a/egui_glium/src/backend.rs b/egui_glium/src/backend.rs
index dcf177c7..a9732dcc 100644
--- a/egui_glium/src/backend.rs
+++ b/egui_glium/src/backend.rs
@@ -57,6 +57,7 @@ impl epi::RepaintSignal for GliumRepaintSignal {
 
 fn create_display(
     title: &str,
+    initial_size_points: Option<Vec2>,
     window_settings: Option<WindowSettings>,
     is_resizable: bool,
     event_loop: &glutin::event_loop::EventLoop<RequestRepaintEvent>,
@@ -69,6 +70,11 @@ fn create_display(
 
     if let Some(window_settings) = &window_settings {
         window_builder = window_settings.initialize_size(window_builder);
+    } else if let Some(initial_size_points) = initial_size_points {
+        window_builder = window_builder.with_inner_size(glutin::dpi::LogicalSize {
+            width: initial_size_points.x as f64,
+            height: initial_size_points.y as f64,
+        });
     }
 
     let context_builder = glutin::ContextBuilder::new()
@@ -135,7 +141,13 @@ pub fn run(mut app: Box<dyn epi::App>) -> ! {
 
     let window_settings = deserialize_window_settings(&storage);
     let event_loop = glutin::event_loop::EventLoop::with_user_event();
-    let display = create_display(app.name(), window_settings, app.is_resizable(), &event_loop);
+    let display = create_display(
+        app.name(),
+        app.initial_window_size(),
+        window_settings,
+        app.is_resizable(),
+        &event_loop,
+    );
 
     let repaint_signal = std::sync::Arc::new(GliumRepaintSignal(std::sync::Mutex::new(
         event_loop.create_proxy(),
diff --git a/egui_glium/src/persistence.rs b/egui_glium/src/persistence.rs
index 2c3ac2ff..f426a30d 100644
--- a/egui_glium/src/persistence.rs
+++ b/egui_glium/src/persistence.rs
@@ -38,6 +38,7 @@ impl epi::Storage for FileStorage {
 
     fn flush(&mut self) {
         if self.dirty {
+            // eprintln!("Persisted to {}", self.path.display());
             serde_json::to_writer(std::fs::File::create(&self.path).unwrap(), &self.kv).unwrap();
             self.dirty = false;
         }
@@ -46,11 +47,11 @@ impl epi::Storage for FileStorage {
 
 // ----------------------------------------------------------------------------
 
-pub fn read_json<T>(memory_json_path: impl AsRef<Path>) -> Option<T>
+pub fn read_json<T>(json_path: impl AsRef<Path>) -> Option<T>
 where
     T: serde::de::DeserializeOwned,
 {
-    match std::fs::File::open(memory_json_path) {
+    match std::fs::File::open(json_path) {
         Ok(file) => {
             let reader = std::io::BufReader::new(file);
             match serde_json::from_reader(reader) {
diff --git a/epi/CHANGELOG.md b/epi/CHANGELOG.md
index ecbe9413..c0b66b5e 100644
--- a/epi/CHANGELOG.md
+++ b/epi/CHANGELOG.md
@@ -7,6 +7,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## Unreleased
 
+* You can control the initial size of the native window with `App::initial_window_size`.
 * You can control the maximum egui web canvas size with `App::max_size_points`.
 
 
diff --git a/epi/src/lib.rs b/epi/src/lib.rs
index 7e348a1a..b14baf40 100644
--- a/epi/src/lib.rs
+++ b/epi/src/lib.rs
@@ -87,6 +87,11 @@ pub trait App {
     /// The name of your App.
     fn name(&self) -> &str;
 
+    /// The initial size of the native window in points (logical pixels).
+    fn initial_window_size(&self) -> Option<egui::Vec2> {
+        None
+    }
+
     /// Time between automatic calls to `save()`
     fn auto_save_interval(&self) -> std::time::Duration {
         std::time::Duration::from_secs(30)