diff --git a/doc/bitstream_filters.texi b/doc/bitstream_filters.texi
index b11d357941..a0092878c8 100644
--- a/doc/bitstream_filters.texi
+++ b/doc/bitstream_filters.texi
@@ -738,6 +738,8 @@ It accepts the following parameters:
 Set expressions for PTS, DTS or both.
 @item duration
 Set expression for duration.
+@item time_base
+Set output time base.
 @end table
 
 The expressions are evaluated through the eval API and can contain the following