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diff --git a/man/blind-set-luma.1 b/man/blind-set-luma.1
index 19b3f08..54d3cde 100644
--- a/man/blind-set-luma.1
+++ b/man/blind-set-luma.1
@@ -21,6 +21,15 @@ If stdin is shorter than
the remainder of
.I alpha-stream
is ignored but may be partially read.
+.SH NOTES
+In most cases, this is not what you want to use, instead
+you probably want to use
+.BR blind-arithm (1)
+to multiple the X, Y and Z values on one value. This
+produces the same affect as reducing the intensity of
+the light sources, which is not what
+.B blind-set-luma
+does.
.SH AUTHORS
Mattias Andree
.RI < maandree@kth.se >