diff --git a/docs/requirements.md b/docs/requirements.md
index e61eee3..20307b3 100644
--- a/docs/requirements.md
+++ b/docs/requirements.md
@@ -198,6 +198,11 @@ The screen is divided into three vertical sections:
   - **Backspace** — activates demolish mode; Backspace again exits it. (See also REQ-UI-DEMOLISH-BUTTON for the equivalent button.)
   - **Q / E** — in builder mode, rotate the ghost counter-clockwise / clockwise (REQ-BLD-ROTATE).
   - **Escape** — opens the escape menu (REQ-UI-GAME-MENU).
+  - **M** — toggles debug draw mode (REQ-UI-DEBUG-DRAW).
+
+### Debug Draw
+
+- REQ-UI-DEBUG-DRAW: A debug draw mode can be toggled on and off with the **M** key (REQ-UI-HOTKEYS). It is inactive by default. While active, the sensor range of every ship — both player and enemy — is drawn as a circle centered on the ship, using that ship role's outline color from `visuals.toml`.
 
 ### Escape Menu