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-rw-r--r--docs/env_vars.md2
1 files changed, 2 insertions, 0 deletions
diff --git a/docs/env_vars.md b/docs/env_vars.md
index 62472783..39daf9fd 100644
--- a/docs/env_vars.md
+++ b/docs/env_vars.md
@@ -12,6 +12,8 @@ wlroots reads these environment variables
renderers: gles2, pixman, vulkan)
* *WLR_RENDER_DRM_DEVICE*: specifies the DRM node to use for
hardware-accelerated renderers.
+* *WLR_EGL_NO_MODIFIERS*: set to 1 to disable format modifiers in EGL, this can
+ be used to understand and work around driver bugs.
## DRM backend