diff --git a/core/src/com/agateau/pixelwheels/screens/DebugScreen.java b/core/src/com/agateau/pixelwheels/screens/DebugScreen.java
index 6d0977b1..754eb673 100644
--- a/core/src/com/agateau/pixelwheels/screens/DebugScreen.java
+++ b/core/src/com/agateau/pixelwheels/screens/DebugScreen.java
@@ -79,7 +79,7 @@ private void setupUi() {
         addRange("Racer count", "racerCount", 1, 6);
         addRange("Border restitution", "borderRestitution", 1, 50);
         addCheckBox("One lap only", "oneLapOnly");
-        addCheckBox("Free camera", "freeCamera");
+        addCheckBox("Free camera\n(move with HJKL keys)", "freeCamera");
 
         mCurrentGroup = tabMenuItem.addPage("Speed");
         addTitle("Speed");