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-rw-r--r--src/gallium/docs/source/tgsi.rst5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
index eceaa6d64f7..7fb963fde5a 100644
--- a/src/gallium/docs/source/tgsi.rst
+++ b/src/gallium/docs/source/tgsi.rst
@@ -3298,8 +3298,9 @@ TGSI_SEMANTIC_SAMPLEMASK
""""""""""""""""""""""""
For fragment shaders, this semantic label indicates that an output contains
-the sample mask used to disable further sample processing
-(i.e. gl_SampleMask). Only the X value is used, up to 32x MS.
+the sample mask used to disable further sample processing. The output's
+type is uint[4] but only the X component is used (i.e. gl_SampleMask[0]).
+Each bit corresponds to one sample position (up to 32x MSAA is supported).
TGSI_SEMANTIC_INVOCATIONID
""""""""""""""""""""""""""