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-rw-r--r--doc/filters.texi6
1 files changed, 6 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi
index a1d5581a4a..fecf7484a7 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -5785,6 +5785,12 @@ above-below with half height resolution
above-below with half height resolution
(right eye above, left eye below)
+@item al
+alternating frames (left eye first, right eye second)
+
+@item ar
+alternating frames (right eye first, left eye second)
+
Default value is @samp{sbsl}.
@end table