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-rw-r--r--src/gallium/docs/source/screen.rst4
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diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst
index 74636207d06..246428deb87 100644
--- a/src/gallium/docs/source/screen.rst
+++ b/src/gallium/docs/source/screen.rst
@@ -254,6 +254,10 @@ The integer capabilities:
and size must be page-aligned.
* ``PIPE_CAP_DEVICE_RESET_STATUS_QUERY``:
Whether pipe_context::get_device_reset_status is implemented.
+* ``PIPE_CAP_MAX_SHADER_PATCH_VARYINGS``:
+ How many per-patch outputs and inputs are supported between tessellation
+ control and tessellation evaluation shaders, not counting in TESSINNER and
+ TESSOUTER. The minimum allowed value for OpenGL is 30.
.. _pipe_capf: