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-rw-r--r--runtime/doc/ui.txt2
1 files changed, 2 insertions, 0 deletions
diff --git a/runtime/doc/ui.txt b/runtime/doc/ui.txt
index 1440e2ac78..7d213f959b 100644
--- a/runtime/doc/ui.txt
+++ b/runtime/doc/ui.txt
@@ -292,6 +292,8 @@ numerical highlight ids to the actual attributes.
`bold`: bold text.
`underline`: underlined text. The line has `special` color.
`undercurl`: undercurled text. The curl has `special` color.
+ `blend`: Blend level (0-100). Could be used by UIs to support
+ blending floating windows to the background.
For absent color keys the default color should be used. Don't store
the default value in the table, rather a sentinel value, so that