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diff --git a/docs/env_vars.md b/docs/env_vars.md
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@@ -10,6 +10,8 @@ wlroots reads these environment variables
of following shell search semantics for "Xwayland")
* *WLR_RENDERER*: forces the creation of a specified renderer (available
renderers: gles2, pixman, vulkan)
+* *WLR_RENDER_DRM_DEVICE*: specifies the DRM node to use for
+ hardware-accelerated renderers.
## DRM backend