diff git a/doc/filters.texi b/doc/filters.texi
index 57088ccc6c..03c1b9bb1f 100644
 a/doc/filters.texi
+++ b/doc/filters.texi
@@ 3167,62 +3167,61 @@ where @code{X} is channel number starting from 1 or string @code{Overall}. Defau
disabled.
Available keys for each channel are:
DC_offset
Min_level
Max_level
Min_difference
Max_difference
Mean_difference
RMS_difference
Peak_level
RMS_peak
RMS_trough
Crest_factor
Flat_factor
Peak_count
Noise_floor
Noise_floor_count
Entropy
Bit_depth
Dynamic_range
Zero_crossings
Zero_crossings_rate
Number_of_NaNs
Number_of_Infs
Number_of_denormals

and for Overall:
DC_offset
Min_level
Max_level
Min_difference
Max_difference
Mean_difference
RMS_difference
Peak_level
RMS_level
RMS_peak
RMS_trough
Flat_factor
Peak_count
Noise_floor
Noise_floor_count
Entropy
Bit_depth
Number_of_samples
Number_of_NaNs
Number_of_Infs
Number_of_denormals

For example full key look like this @code{lavfi.astats.1.DC_offset} or
this @code{lavfi.astats.Overall.Peak_count}.

For description what each key means read below.
+@var{Bit_depth}
+@var{Crest_factor}
+@var{DC_offset}
+@var{Dynamic_range}
+@var{Entropy}
+@var{Flat_factor}
+@var{Max_difference}
+@var{Max_level}
+@var{Mean_difference}
+@var{Min_difference}
+@var{Min_level}
+@var{Noise_floor}
+@var{Noise_floor_count}
+@var{Number_of_Infs}
+@var{Number_of_NaNs}
+@var{Number_of_denormals}
+@var{Peak_count}
+@var{Peak_level}
+@var{RMS_difference}
+@var{RMS_peak}
+@var{RMS_trough}
+@var{Zero_crossings}
+@var{Zero_crossings_rate}
+
+and for @code{Overall}:
+@var{Bit_depth}
+@var{DC_offset}
+@var{Entropy}
+@var{Flat_factor}
+@var{Max_difference}
+@var{Max_level}
+@var{Mean_difference}
+@var{Min_difference}
+@var{Min_level}
+@var{Noise_floor}
+@var{Noise_floor_count}
+@var{Number_of_Infs}
+@var{Number_of_NaNs}
+@var{Number_of_denormals}
+@var{Number_of_samples}
+@var{Peak_count}
+@var{Peak_level}
+@var{RMS_difference}
+@var{RMS_level}
+@var{RMS_peak}
+@var{RMS_trough}
+
+For example, a full key looks like @code{lavfi.astats.1.DC_offset} or
+@code{lavfi.astats.Overall.Peak_count}.
+
+Read below for the description of the keys.
@item reset
Set the number of frames over which cumulative stats are calculated before
being reset
Default is disabled.
+being reset. Default is disabled.
@item measure_perchannel
Select the parameters which are measured per channel. The metadata keys can
@@ 3236,71 +3235,91 @@ be used as flags, default is @option{all} which measures everything.
@end table
A description of each shown parameter follows:
+A description of the measure keys follow:
@table @option
@item DC offset
Mean amplitude displacement from zero.
+@item none
+no measures
@item Min level
Minimal sample level.
+@item all
+all measures
@item Max level
Maximal sample level.
+@item Bit_depth
+overall bit depth of audio, i.e. number of bits used for each sample
@item Min difference
Minimal difference between two consecutive samples.
+@item Crest_factor
+standard ratio of peak to RMS level (note: not in dB)
@item Max difference
Maximal difference between two consecutive samples.
+@item DC_offset
+mean amplitude displacement from zero
@item Mean difference
Mean difference between two consecutive samples.
The average of each difference between two consecutive samples.
+@item Dynamic_range
+measured dynamic range of audio in dB
@item RMS difference
Root Mean Square difference between two consecutive samples.
+@item Entropy
+entropy measured across whole audio, entropy of value near 1.0 is typically measured for white noise
@item Peak level dB
@item RMS level dB
Standard peak and RMS level measured in dBFS.
+@item Flat_factor
+flatness (i.e. consecutive samples with the same value) of the signal at its peak levels
+(i.e. either @var{Min_level} or @var{Max_level})
@item RMS peak dB
@item RMS trough dB
Peak and trough values for RMS level measured over a short window.
+@item Max_difference
+maximal difference between two consecutive samples
@item Crest factor
Standard ratio of peak to RMS level (note: not in dB).
+@item Max_level
+maximal sample level
@item Flat factor
Flatness (i.e. consecutive samples with the same value) of the signal at its peak levels
(i.e. either @var{Min level} or @var{Max level}).
+@item Mean_difference
+mean difference between two consecutive samples, i.e. the average of each difference between two consecutive samples
@item Peak count
Number of occasions (not the number of samples) that the signal attained either
@var{Min level} or @var{Max level}.
+@item Min_difference
+minimal difference between two consecutive samples
@item Noise floor dB
Minimum local peak measured in dBFS over a short window.
+@item Min_level
+minimal sample level
@item Noise floor count
Number of occasions (not the number of samples) that the signal attained
@var{Noise floor}.
+@item Noise_floor
+minimum local peak measured in dBFS over a short window
@item Entropy
Entropy measured across whole audio. Entropy of value near 1.0 is typically measured for white noise.
+@item Noise_floor_count
+number of occasions (not the number of samples) that the signal attained
+@var{Noise floor}
+
+@item Number_of_Infs
+number of samples with an infinite value
+
+@item Number_of_NaNs
+number of samples with a NaN (not a number) value
+
+@item Number_of_denormals
+number of samples with a subnormal value
+
+@item Number_of_samples
+number of samples
+
+@item Peak_count
+number of occasions (not the number of samples) that the signal attained either
+@var{Min_level} or @var{Max_level}
+
+@item Peak_level
+standard peak level measured in dBFS
+
+@item RMS_difference
+Root Mean Square difference between two consecutive samples
@item Bit depth
Overall bit depth of audio. Number of bits used for each sample.
+@item RMS_level
+standard RMS level measured in dBFS
@item Dynamic range
Measured dynamic range of audio in dB.
+@item RMS_peak
+@item RMS_trough
+peak and trough values for RMS level measured over a short window,
+measured in dBFS.
@item Zero crossings
Number of points where the waveform crosses the zero level axis.
+number of points where the waveform crosses the zero level axis
@item Zero crossings rate
Rate of Zero crossings and number of audio samples.
+rate of Zero crossings and number of audio samples
@end table
@section asubboost