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diff --git a/DOCS/man/vo.rst b/DOCS/man/vo.rst
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@@ -484,10 +484,21 @@ Available video output drivers are:
argument to disambiguate.
(default: empty)
- ``--drm-mode=<number>``
- Mode ID to use (resolution and frame rate). Use ``--drm-mode=help`` to
- get a list of available modes for all active connectors.
- (default: 0)
+ ``--drm-mode=<preferred|highest|N|WxH[@R]>``
+ Mode to use (resolution and frame rate).
+ Possible values:
+
+ :preferred: Use the preferred mode for the screen on the selected
+ connector. (default)
+ :highest: Use the mode with the highest resolution available on the
+ selected connector.
+ :N: Select mode by index.
+ :WxH[@R]: Specify mode by width, height, and optionally refresh rate.
+ In case several modes match, selects the mode that comes
+ first in the EDID list of modes.
+
+ Use ``--drm-mode=help`` to get a list of available modes for all active
+ connectors.
``--drm-atomic=<no|auto>``
Toggle use of atomic modesetting. Mostly useful for debugging.