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-rw-r--r--man/blind-gauss-blur.13
1 files changed, 2 insertions, 1 deletions
diff --git a/man/blind-gauss-blur.1 b/man/blind-gauss-blur.1
index b4ad24d..a9f541d 100644
--- a/man/blind-gauss-blur.1
+++ b/man/blind-gauss-blur.1
@@ -39,7 +39,8 @@ is ignored but may be partially read.
.TP
.B -a
Used to optimise performance if it is known that
-the video is opaque.
+the video is opaque, and to ensure that the output
+video is opaque.
.TP
.B -c
Blur the chroma only, not the luma.