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-rw-r--r--src/gallium/docs/source/context.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/gallium/docs/source/context.rst b/src/gallium/docs/source/context.rst
index 7439d10097..69e0fccc03 100644
--- a/src/gallium/docs/source/context.rst
+++ b/src/gallium/docs/source/context.rst
@@ -153,6 +153,9 @@ vertex attributes.
If ``indexBuffer`` is NULL, the sequential numbers are used directly
as indices to fetch vertex attributes.
+``indexBias`` is a value which is added to every index read from the index
+buffer before fetching vertex attributes.
+
If a given vertex element has ``instance_divisor`` set to 0, it is said
it contains per-vertex data and effective vertex attribute address needs
to be recalculated for every index.