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-rw-r--r--doc/filters.texi4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi
index 6e616b26b4..694e5a1682 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -3068,6 +3068,10 @@ The x and y offsets for the text shadow position with respect to the
position of the text. They can be either positive or negative
values. Default value for both is "0".
+@item start_number
+The starting frame number for the n/frame_num variable. The default value
+is "0".
+
@item tabsize
The size in number of spaces to use for rendering the tab.
Default value is 4.