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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 1b1a5fd6..b67d1652 100644
--- a/docs/env_vars.md
+++ b/docs/env_vars.md
@@ -7,6 +7,8 @@ wlroots specific
considered the primary DRM device.
* *WLR_DRM_NO_ATOMIC*: set to 1 to use legacy DRM interface instead of atomic
mode setting
+* *WLR_DRM_NO_ATOMIC_GAMMA*: set to 1 to use legacy DRM interface for gamma
+ control instead of the atomic interface
* *WLR_LIBINPUT_NO_DEVICES*: set to 1 to not fail without any input devices
* *WLR_BACKENDS*: comma-separated list of backends to use (available backends:
wayland, x11, headless)