diff --git a/deploy/README.md b/deploy/README.md
index 808581a..e164b6a 100644
--- a/deploy/README.md
+++ b/deploy/README.md
@@ -105,6 +105,17 @@ Validate on device per `docs/hardware-bringup.md` before trusting output (the Ha
 decode is unit-locked, but the HailoRT inference + picamera2 color order are hardware-
 validated). USB webcam stays available anytime via `CAMERA_BACKEND=uvc`.
 
+**Multiple cameras at once.** Set `CAMERAS=backend:device:camera_id,...` to run several
+cameras in one daemon — each gets its own detection pipeline and `camera_id`, they share
+the Hailo device (round-robin) and the offline queue, and cloud zones are routed to the
+matching camera. Example — CSI + USB together:
+
+```ini
+CAMERAS=csi:0:cam-01,uvc:0:cam-02
+```
+
+Each `camera_id` must match the `camera_id` on that camera's zones in the cloud.
+
 > **Air gap:** `hailo-all` / `python3-picamera2` are the ONE piece this bundle can't
 > carry (Hailo's own driver + apt tree). Pre-install them on the Pi image, or transfer
 > their `.deb`s separately, before running `install_offline.sh`. The pose HEF is
diff --git a/deploy/systemd/move-detect-edge.env.example b/deploy/systemd/move-detect-edge.env.example
index b152ba0..9ed4b81 100644
--- a/deploy/systemd/move-detect-edge.env.example
+++ b/deploy/systemd/move-detect-edge.env.example
@@ -28,6 +28,10 @@ CAMERA_BACKEND=uvc
 UVC_DEVICE=0
 # CSI_DEVICE: picamera2 camera_num for the CSI camera (used when CAMERA_BACKEND=csi).
 CSI_DEVICE=0
+# CAMERAS (optional): run several cameras at once; overrides CAMERA_BACKEND/*_DEVICE.
+# Format backend:device:camera_id, comma-separated. Each camera_id must match its
+# cloud zones. Example — CSI + USB together on a Hailo Pi:
+#CAMERAS=csi:0:cam-01,uvc:0:cam-02
 # TARGET_FPS: frame pacing = 1/TARGET_FPS.
 TARGET_FPS=12