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diff --git a/DOCS/man/vo.rst b/DOCS/man/vo.rst
index ccde336264..a3cc328b1d 100644
--- a/DOCS/man/vo.rst
+++ b/DOCS/man/vo.rst
@@ -488,19 +488,21 @@ Available video output drivers are:
Mode ID to use (resolution and frame rate).
(default: 0)
- ``--drm-osd-plane-id=<number>``
- Select the DRM plane index to use for OSD (or OSD and video).
- Index is zero based, and related to crtc.
- When using this option with the drm_prime renderer, it will only affect
- the OSD contents. Otherwise it will set OSD & video plane.
- (default: primary plane)
-
- ``--drm-video-plane-id=<number>``
- Select the DRM plane index to use for video layer.
- Index is zero based, and related to crtc.
- This option only has effect when using the drm_prime renderer (which
- supports several layers) together with ``vo=gpu`` and ``gpu-context=drm``.
- (default: first overlay plane)
+ ``--drm-osd-plane-id=<primary|overlay|N>``
+ Select the DRM plane to use for OSD (or OSD and video). The plane can be
+ specified as ``primary``, which will pick the first applicable primary
+ plane; ``overlay``, which will pick the first applicable overlay plane;
+ or by index. The index is zero based, and related to the CRTC. When using
+ this option with the drm_prime renderer, it will only affect the OSD
+ contents. Otherwise it will set OSD & video plane.
+ (default: primary)
+
+ ``--drm-video-plane-id=<primary|overlay|N>``
+ Select the DRM plane index to use for video layer. This option accepts
+ the same values as ``--drm-osd-plane-id``. This option has an effect
+ only when using the drm_prime renderer (which supports several layers)
+ together with ``vo=gpu`` and ``gpu-context=drm``.
+ (default: overlay)
``--drm-format=<xrgb8888|xrgb2101010>``
Select the DRM format to use (default: xrgb8888). This allows you to