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-rw-r--r--src/gallium/docs/source/tgsi.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
index 492a1b7ea30..ebee4902b05 100644
--- a/src/gallium/docs/source/tgsi.rst
+++ b/src/gallium/docs/source/tgsi.rst
@@ -1253,7 +1253,8 @@ can be stored inside a four-component vector.
TGSI_SEMANTIC_NORMAL
""""""""""""""""""""
-XXX no clue.
+Vertex normal; could be used to implement per-pixel lighting for legacy APIs
+that allow mixing fixed-function and programmable stages.
TGSI_SEMANTIC_FACE
""""""""""""""""""