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1 files changed, 3 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi
index d9874b6be6..9804c0e29d 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -209,6 +209,9 @@ The expression is evaluated through the eval API and can contain the following
constants:
@table @option
+@item FRAME_RATE
+frame rate, only defined for constant frame-rate video
+
@item PTS
the presentation timestamp in input