diff --git a/crates/egui/src/memory/theme.rs b/crates/egui/src/memory/theme.rs
index dd4d3d6f..555edaed 100644
--- a/crates/egui/src/memory/theme.rs
+++ b/crates/egui/src/memory/theme.rs
@@ -89,9 +89,32 @@ impl ThemePreference {
     /// Show radio-buttons to switch between light mode, dark mode and following the system theme.
     pub fn radio_buttons(&mut self, ui: &mut crate::Ui) {
         ui.horizontal(|ui| {
-            ui.selectable_value(self, Self::Light, "☀ Light");
-            ui.selectable_value(self, Self::Dark, "🌙 Dark");
-            ui.selectable_value(self, Self::System, "💻 System");
+            let system_theme = ui.ctx().input(|i| i.raw.system_theme);
+
+            ui.selectable_value(self, Self::System, "💻 System")
+                .on_hover_ui(|ui| {
+                    ui.label("Follow the system theme preference.");
+
+                    ui.add_space(4.0);
+
+                    if let Some(system_theme) = system_theme {
+                        ui.label(format!(
+                            "The current system theme is: {}",
+                            match system_theme {
+                                Theme::Dark => "dark",
+                                Theme::Light => "light",
+                            }
+                        ));
+                    } else {
+                        ui.label("The system theme is unknown.");
+                    }
+                });
+
+            ui.selectable_value(self, Self::Dark, "🌙 Dark")
+                .on_hover_text("Use the dark mode theme");
+
+            ui.selectable_value(self, Self::Light, "☀ Light")
+                .on_hover_text("Use the light mode theme");
         });
     }
 }