diff --git a/docs/operational-env.md b/docs/operational-env.md
index 5da010a..12e7af9 100644
--- a/docs/operational-env.md
+++ b/docs/operational-env.md
@@ -40,6 +40,7 @@ from `LESAVKA_CLIENT_PKI_SSH_SOURCE` over SSH. Runtime clients require the insta
 | `LESAVKA_CAM_ALLOW_PROFILE_OVERRIDE` | lab-only override that lets launcher camera width/height/fps env values beat the server-negotiated UVC profile |
 | `LESAVKA_CAM_BY_ID_DIR` | client media capture/playback override |
 | `LESAVKA_CAM_CODEC` | client media capture/playback override |
+| `LESAVKA_CAM_CODEC_FORCE` | lab/debug override that lets `LESAVKA_CAM_CODEC` replace the server-negotiated camera codec; leave unset for normal sessions so the client stays aligned with the active UVC contract |
 | `LESAVKA_CAM_DEV_ROOT` | client media capture/playback override |
 | `LESAVKA_CAM_DISABLE` | client media capture/playback override |
 | `LESAVKA_CAM_FORMAT` | client media capture/playback override |