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-rw-r--r--info/blueshift.texinfo3
1 files changed, 3 insertions, 0 deletions
diff --git a/info/blueshift.texinfo b/info/blueshift.texinfo
index c4f7242..d32aba6 100644
--- a/info/blueshift.texinfo
+++ b/info/blueshift.texinfo
@@ -320,6 +320,9 @@ Adjusts the gamma to @code{r}, @code{g}
and @code{b} on the red, green and blue curves,
respectively.
+@item negative()
+Inverts the all values on the colour curves.
+
@item negative(rgb)
Inverts the all values on the colour curves
if @code{rgb} is @code{True}.