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diff --git a/doc/filters.texi b/doc/filters.texi
index 2fe7ff7b8c8..773ab246b29 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -3002,6 +3002,15 @@ The default is 0.707q and gives a Butterworth response.
 Specify which channels to filter, by default all available are filtered.
 @end table
 
+@subsection Examples
+@itemize
+@item
+Lowpass only LFE channel, it LFE is not present it does nothing:
+@example
+lowpass=c=LFE
+@end example
+@end itemize
+
 @anchor{pan}
 @section pan
 
@@ -10916,6 +10925,29 @@ format=monow, pixdesctest
 
 can be used to test the monowhite pixel format descriptor definition.
 
+@section pixscope
+
+Display sample values of color channels. Mainly useful for checking color and levels.
+
+The filters accept the following options:
+
+@table @option
+@item x
+Set scope X position, offset on X axis.
+
+@item y
+Set scope Y position, offset on Y axis.
+
+@item w
+Set scope width.
+
+@item h
+Set scope height.
+
+@item o
+Set window opacity. This window also holds statistics about pixel area.
+@end table
+
 @section pp
 
 Enable the specified chain of postprocessing subfilters using libpostproc. This