diff --git a/docs/env.md b/docs/env.md
index cfaff01..1a3e2b2 100644
--- a/docs/env.md
+++ b/docs/env.md
@@ -4,6 +4,7 @@ Unless specified otherwise, a variable is enabled if and only if it's set to `1`
 
 ### DRM
 
+`AQ_DRM_DEVICES` -> Set an explicit list of DRM devices (GPUs) to use. It's a colon-separated list of paths, with the first being the primary. E.g. `/dev/dri/card1:/dev/dri/card0`
 `AQ_NO_ATOMIC` -> Disables drm atomic modesetting
 `AQ_MGPU_NO_EXPLICIT` -> Disables explicit syncing on mgpu buffers