diff --git a/client/src/graphics/gui.rs b/client/src/graphics/gui.rs
index e0fc2351..14353cc6 100644
--- a/client/src/graphics/gui.rs
+++ b/client/src/graphics/gui.rs
@@ -1,4 +1,8 @@
-use yakui::{align, colored_box, Alignment, Color};
+use yakui::{
+    align, colored_box, colored_box_container, label, pad, widgets::Pad, Alignment, Color,
+};
+
+use crate::Sim;
 
 pub struct GuiState {
     show_gui: bool,
@@ -16,7 +20,7 @@ impl GuiState {
 
     /// Prepare the GUI for rendering. This should be called between
     /// Yakui::start and Yakui::finish.
-    pub fn run(&self) {
+    pub fn run(&self, sim: &Sim) {
         if !self.show_gui {
             return;
         }
@@ -24,5 +28,13 @@ impl GuiState {
         align(Alignment::CENTER, || {
             colored_box(Color::BLACK.with_alpha(0.9), [5.0, 5.0]);
         });
+
+        align(Alignment::TOP_LEFT, || {
+            pad(Pad::all(8.0), || {
+                colored_box_container(Color::BLACK.with_alpha(0.7), || {
+                    label(format!("Selected material: {:?}", sim.selected_material()));
+                });
+            });
+        });
     }
 }
diff --git a/client/src/graphics/window.rs b/client/src/graphics/window.rs
index cf27dba0..e4302df5 100644
--- a/client/src/graphics/window.rs
+++ b/client/src/graphics/window.rs
@@ -366,7 +366,9 @@ impl Window {
                     [extent.width as f32, extent.height as f32].into(),
                 ));
             self.yak.start();
-            self.gui_state.run();
+            if let Some(sim) = self.sim.as_ref() {
+                self.gui_state.run(sim);
+            }
             self.yak.finish();
             // Render the frame
             draw.draw(
diff --git a/client/src/sim.rs b/client/src/sim.rs
index 8abfe08c..9f59582f 100644
--- a/client/src/sim.rs
+++ b/client/src/sim.rs
@@ -161,6 +161,10 @@ impl Sim {
         self.selected_material = *MATERIAL_PALETTE.get(idx).unwrap_or(&MATERIAL_PALETTE[0]);
     }
 
+    pub fn selected_material(&self) -> Material {
+        self.selected_material
+    }
+
     pub fn set_break_block_pressed_true(&mut self) {
         self.break_block_pressed = true;
     }