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-rw-r--r--doc/filters.texi1
1 files changed, 1 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi
index 568c2995bc..4f21276abf 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -15374,6 +15374,7 @@ Set morphological transform to apply, can be:
@item dilate
@item open
@item close
+@item gradient
@end table
Default is @code{erode}.