diff --git a/apps/artcraft-launcher/src/main.rs b/apps/artcraft-launcher/src/main.rs
index c1dcdf19..556fd948 100644
--- a/apps/artcraft-launcher/src/main.rs
+++ b/apps/artcraft-launcher/src/main.rs
@@ -790,10 +790,14 @@ impl eframe::App for Shell<'_> {
         if ctx.input(|i| i.viewport().close_requested()) && !self.quitting && !self.launcher.closed_to_tray {
             match on_close(self.launcher.tray.is_some(), self.launcher.ui.settings.close_to_tray, self.window_hides) {
                 OnClose::Hide => {
+                    self.launcher.ui.hidden_to_tray(&mut self.launcher.host);
                     ctx.send_viewport_cmd(egui::ViewportCommand::CancelClose);
                     self.put_away(ctx);
                 }
-                OnClose::ToTray => self.launcher.closed_to_tray = true,
+                OnClose::ToTray => {
+                    self.launcher.ui.hidden_to_tray(&mut self.launcher.host);
+                    self.launcher.closed_to_tray = true;
+                }
                 OnClose::Quit => {}
             }
         }
diff --git a/crates/ui-egui/src/app.rs b/crates/ui-egui/src/app.rs
index 18c2bf7e..d5ab6670 100644
--- a/crates/ui-egui/src/app.rs
+++ b/crates/ui-egui/src/app.rs
@@ -520,6 +520,20 @@ impl LauncherUi {
         }
     }
 
+    /// The user closed the window and it went away in the tray. The first time, a notification
+    /// says so, with where to find it and how to quit: a window that vanishes with nothing to show
+    /// for it looks hung (#45, #215).
+    pub fn hidden_to_tray(&mut self, host: &mut dyn Host) {
+        if self.settings.tray_hint_shown {
+            return;
+        }
+        self.settings.tray_hint_shown = true;
+        host.notify(
+            tl!("ArtCraft Launcher is still running"),
+            tl!("It's in the tray: open it or quit it from the tray icon, or turn this off in the settings."),
+        );
+    }
+
     /// When auto-updates are enabled, automatically downloads and installs pending updates.
     pub(crate) fn trigger_auto_updates(&mut self) {
         if !self.caps.manage_apps || !self.settings.auto_update {
diff --git a/crates/ui-egui/src/i18n/cs.tsv b/crates/ui-egui/src/i18n/cs.tsv
index 8be87a74..734feae9 100644
--- a/crates/ui-egui/src/i18n/cs.tsv
+++ b/crates/ui-egui/src/i18n/cs.tsv
@@ -83,6 +83,8 @@
 	Updates always use the format an app was installed with.	Aktualizace vždy použijí formát, ve kterém byla aplikace nainstalována.
 	Running in the background	Běh na pozadí
 	Keep running in the tray when the window is closed	Po zavření okna ponechat spuštěné v oznamovací oblasti
+	ArtCraft Launcher is still running	ArtCraft Launcher stále běží
+	It's in the tray: open it or quit it from the tray icon, or turn this off in the settings.	Je v oznamovací oblasti: otevřete ho nebo ukončete přes ikonu v ní, nebo to vypněte v nastavení.
 	Show the window on the current desktop	Zobrazit okno na aktuální ploše
 	Start ArtCraft Launcher when I log in	Spouštět ArtCraft Launcher po přihlášení
 	Community	Komunita
diff --git a/crates/ui-egui/src/i18n/de.tsv b/crates/ui-egui/src/i18n/de.tsv
index 8922120a..818f1d13 100644
--- a/crates/ui-egui/src/i18n/de.tsv
+++ b/crates/ui-egui/src/i18n/de.tsv
@@ -96,6 +96,8 @@
 	Updates always use the format an app was installed with.	Updates verwenden immer das Format, mit dem eine App installiert wurde.
 	Running in the background	Im Hintergrund ausführen
 	Keep running in the tray when the window is closed	Beim Schließen des Fensters im Infobereich weiterlaufen
+	ArtCraft Launcher is still running	ArtCraft Launcher läuft weiter
+	It's in the tray: open it or quit it from the tray icon, or turn this off in the settings.	Er ist im Infobereich: dort über das Symbol öffnen oder beenden, oder das in den Einstellungen abschalten.
 	Show the window on the current desktop	Fenster auf dem aktuellen Schreibtisch zeigen
 	Start ArtCraft Launcher when I log in	ArtCraft Launcher bei der Anmeldung starten
 	Community	Community
diff --git a/crates/ui-egui/src/i18n/es.tsv b/crates/ui-egui/src/i18n/es.tsv
index 31efb0b1..e49ea55d 100644
--- a/crates/ui-egui/src/i18n/es.tsv
+++ b/crates/ui-egui/src/i18n/es.tsv
@@ -96,6 +96,8 @@
 	Updates always use the format an app was installed with.	Las actualizaciones siempre usan el formato con el que se instaló cada aplicación.
 	Running in the background	En segundo plano
 	Keep running in the tray when the window is closed	Seguir abierto en la bandeja del sistema al cerrar la ventana
+	ArtCraft Launcher is still running	ArtCraft Launcher sigue abierto
+	It's in the tray: open it or quit it from the tray icon, or turn this off in the settings.	Está en la bandeja del sistema: ábrelo o ciérralo desde su icono, o desactiva esto en los ajustes.
 	Show the window on the current desktop	Mostrar la ventana en el escritorio actual
 	Start ArtCraft Launcher when I log in	Abrir ArtCraft Launcher al iniciar sesión
 	Community	Comunidad
diff --git a/crates/ui-egui/src/i18n/fr.tsv b/crates/ui-egui/src/i18n/fr.tsv
index 13300d2a..635974f2 100644
--- a/crates/ui-egui/src/i18n/fr.tsv
+++ b/crates/ui-egui/src/i18n/fr.tsv
@@ -94,6 +94,8 @@
 	Updates always use the format an app was installed with.	Les mises à jour utilisent toujours le format avec lequel l'application a été installée.
 	Running in the background	Exécution en arrière-plan
 	Keep running in the tray when the window is closed	Rester actif dans la zone de notification à la fermeture de la fenêtre
+	ArtCraft Launcher is still running	ArtCraft Launcher est toujours en cours
+	It's in the tray: open it or quit it from the tray icon, or turn this off in the settings.	Il est dans la zone de notification : ouvrez-le ou quittez-le depuis son icône, ou désactivez ceci dans les réglages.
 	Show the window on the current desktop	Afficher la fenêtre sur le bureau actuel
 	Start ArtCraft Launcher when I log in	Lancer ArtCraft Launcher à l'ouverture de session
 	Community	Communauté
diff --git a/crates/ui-egui/src/i18n/hu.tsv b/crates/ui-egui/src/i18n/hu.tsv
index 3dae1b52..d25bd5ba 100644
--- a/crates/ui-egui/src/i18n/hu.tsv
+++ b/crates/ui-egui/src/i18n/hu.tsv
@@ -96,6 +96,8 @@
 	Updates always use the format an app was installed with.	A frissítések mindig az eredeti telepítés csomagformátumát használják.
 	Running in the background	Futtatás a háttérben
 	Keep running in the tray when the window is closed	Az ablak bezárásakor kerüljön a tálcára
+	ArtCraft Launcher is still running	Az ArtCraft Launcher továbbra is fut
+	It's in the tray: open it or quit it from the tray icon, or turn this off in the settings.	A tálcára került: az ikonjáról megnyitható vagy bezárható, vagy kapcsolja ki ezt a beállításokban.
 	Show the window on the current desktop	Ablak megjelenítése az aktuális asztalon
 	Start ArtCraft Launcher when I log in	ArtCraft Launcher indítása bejelentkezéskor
 	Community	Közösség
diff --git a/crates/ui-egui/src/i18n/ja.tsv b/crates/ui-egui/src/i18n/ja.tsv
index eafe2c9f..2c08acb0 100644
--- a/crates/ui-egui/src/i18n/ja.tsv
+++ b/crates/ui-egui/src/i18n/ja.tsv
@@ -98,6 +98,8 @@
 	Updates always use the format an app was installed with.	更新は常に、アプリをインストールしたときの形式で行われます。
 	Running in the background	バックグラウンドで実行
 	Keep running in the tray when the window is closed	ウィンドウを閉じてもトレイで実行し続ける
+	ArtCraft Launcher is still running	ArtCraft Launcher は実行中です
+	It's in the tray: open it or quit it from the tray icon, or turn this off in the settings.	トレイに入りました。トレイのアイコンから開くか終了できます。設定でこの動作を無効にすることもできます。
 	Show the window on the current desktop	現在のデスクトップにウィンドウを表示
 	Start ArtCraft Launcher when I log in	ログイン時に ArtCraft Launcher を起動
 	Community	コミュニティ
diff --git a/crates/ui-egui/src/i18n/pl.tsv b/crates/ui-egui/src/i18n/pl.tsv
index b12112c3..bc95769b 100644
--- a/crates/ui-egui/src/i18n/pl.tsv
+++ b/crates/ui-egui/src/i18n/pl.tsv
@@ -97,6 +97,8 @@
 	Updates always use the format an app was installed with.	Aktualizacje zawsze używają formatu, w jakim pierwotnie zainstalowano aplikację.
 	Running in the background	Działanie w tle
 	Keep running in the tray when the window is closed	Po zamknięciu okna działaj w zasobniku systemowym
+	ArtCraft Launcher is still running	ArtCraft Launcher nadal działa
+	It's in the tray: open it or quit it from the tray icon, or turn this off in the settings.	Jest w zasobniku systemowym: otwórz go lub zamknij z jego ikony, albo wyłącz to w ustawieniach.
 	Show the window on the current desktop	Pokaż okno na bieżącym pulpicie
 	Start ArtCraft Launcher when I log in	Uruchom ArtCraft Launcher po zalogowaniu
 	Community	Społeczność
diff --git a/crates/ui-egui/src/i18n/pt-BR.tsv b/crates/ui-egui/src/i18n/pt-BR.tsv
index c185c19a..2081977c 100644
--- a/crates/ui-egui/src/i18n/pt-BR.tsv
+++ b/crates/ui-egui/src/i18n/pt-BR.tsv
@@ -84,6 +84,8 @@
 	Updates always use the format an app was installed with.	As atualizações sempre usam o formato com o qual o aplicativo foi instalado.
 	Running in the background	Execução em segundo plano
 	Keep running in the tray when the window is closed	Continuar na bandeja do sistema ao fechar a janela
+	ArtCraft Launcher is still running	O ArtCraft Launcher continua aberto
+	It's in the tray: open it or quit it from the tray icon, or turn this off in the settings.	Ele está na bandeja do sistema: abra-o ou encerre-o pelo ícone, ou desative isso nas configurações.
 	Show the window on the current desktop	Mostrar a janela na área de trabalho atual
 	Start ArtCraft Launcher when I log in	Iniciar o ArtCraft Launcher ao fazer login
 	Community	Comunidade
diff --git a/crates/ui-egui/src/i18n/ru.tsv b/crates/ui-egui/src/i18n/ru.tsv
index 7df8058b..94de7563 100644
--- a/crates/ui-egui/src/i18n/ru.tsv
+++ b/crates/ui-egui/src/i18n/ru.tsv
@@ -94,6 +94,8 @@
 	Updates always use the format an app was installed with.	Обновления всегда используют формат, с которым приложение было установлено.
 	Running in the background	Работа в фоне
 	Keep running in the tray when the window is closed	Оставаться в трее при закрытии окна
+	ArtCraft Launcher is still running	ArtCraft Launcher продолжает работать
+	It's in the tray: open it or quit it from the tray icon, or turn this off in the settings.	Он в трее: откройте или закройте его через значок в трее, либо отключите это в настройках.
 	Show the window on the current desktop	Показывать окно на текущем рабочем столе
 	Start ArtCraft Launcher when I log in	Запускать ArtCraft Launcher при входе в систему
 	Community	Сообщество
diff --git a/crates/ui-egui/src/i18n/zh-CN.tsv b/crates/ui-egui/src/i18n/zh-CN.tsv
index 7c14a6f2..4cdcb1f4 100644
--- a/crates/ui-egui/src/i18n/zh-CN.tsv
+++ b/crates/ui-egui/src/i18n/zh-CN.tsv
@@ -78,6 +78,8 @@
 	Updates always use the format an app was installed with.	更新时始终使用应用原来的安装格式。
 	Running in the background	后台运行
 	Keep running in the tray when the window is closed	关闭窗口后继续在系统托盘中运行
+	ArtCraft Launcher is still running	ArtCraft Launcher 仍在运行
+	It's in the tray: open it or quit it from the tray icon, or turn this off in the settings.	它已进入系统托盘：可通过托盘图标打开或退出，也可在设置中关闭此行为。
 	Show the window on the current desktop	在当前桌面显示窗口
 	Start ArtCraft Launcher when I log in	登录时启动 ArtCraft Launcher
 	Community	社区
diff --git a/crates/ui-egui/src/settings.rs b/crates/ui-egui/src/settings.rs
index 75b644f7..fca30b6d 100644
--- a/crates/ui-egui/src/settings.rs
+++ b/crates/ui-egui/src/settings.rs
@@ -118,6 +118,8 @@ pub struct Settings {
     pub last_check: Option<i64>,
     /// Catalog ids of apps hidden from the main lists (`photocraft`, …).
     pub hidden: std::collections::BTreeSet<String>,
+    /// The one-time notice that closing the window keeps the launcher in the tray has been shown.
+    pub tray_hint_shown: bool,
     /// How many times each app was opened from the launcher (catalog id → count), for "Frequently used".
     pub launches: BTreeMap<String, u32>,
 }
@@ -200,6 +202,7 @@ impl Default for Settings {
             notified: BTreeMap::new(),
             last_check: None,
             hidden: std::collections::BTreeSet::new(),
+            tray_hint_shown: false,
             launches: BTreeMap::new(),
         }
     }
diff --git a/crates/ui-egui/tests/ui.rs b/crates/ui-egui/tests/ui.rs
index 565c972f..b9bdab73 100644
--- a/crates/ui-egui/tests/ui.rs
+++ b/crates/ui-egui/tests/ui.rs
@@ -802,6 +802,28 @@ fn every_table_column_sorts_both_ways() {
     assert_eq!(o.first().map(String::as_str), Some("WordCraft"), "{o:?}");
 }
 
+/// The first close to the tray is explained once, by a system notification (#45, #215).
+#[test]
+fn the_first_close_to_the_tray_is_explained_once() {
+    struct Notices(Vec<(String, String)>);
+    impl Host for Notices {
+        fn notify(&mut self, title: &str, body: &str) {
+            self.0.push((title.to_string(), body.to_string()));
+        }
+    }
+    let (mut h, _) = harness(ViewMode::Grid, egui::Theme::Dark, true);
+    h.run_steps(6);
+    let mut host = Notices(Vec::new());
+    let l = h.state_mut().as_mut().unwrap();
+    assert!(!l.settings.tray_hint_shown);
+    l.hidden_to_tray(&mut host);
+    l.hidden_to_tray(&mut host);
+    assert!(l.settings.tray_hint_shown);
+    assert_eq!(host.0.len(), 1, "{:?}", host.0);
+    assert_eq!(host.0[0].0, "ArtCraft Launcher is still running");
+    assert!(host.0[0].1.contains("tray icon"), "{}", host.0[0].1);
+}
+
 #[test]
 fn settings_link_to_discord() {
     let (mut h, _) = harness(ViewMode::Grid, egui::Theme::Dark, true);