diff --git a/NPMK/NSx Utilities/NSxPowerSpectrum.m b/NPMK/NSx Utilities/NSxPowerSpectrum.m
index c10d0e6..a030017 100644
--- a/NPMK/NSx Utilities/NSxPowerSpectrum.m	
+++ b/NPMK/NSx Utilities/NSxPowerSpectrum.m	
@@ -1,5 +1,35 @@
 function NSxPowerSpectrum(NSx, channelNumber, colorCode)
 
+% NSxPowerSpectrum
+%
+% Plots a power spectrum of a given channel.
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
+% Use NSxPowerSpectrum
+%
+% Use settingsManager(NSx, channelNumber, colorCode)
+%
+%   NSx:           The NSx file containing the data.
+%
+%   channelNumber: The channel to be plotted.
+%
+%   colorCode:     The color of the plot. This follows the standard "plot"
+%                  colors in MATLAB. See "help plot" for more information.
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%   Kian Torab
+%   support@blackrockmicro.com
+%   Blackrock Microsystems
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Version History
+%
+% 1.1.0.0: October 2, 2020
+%   - Fixed a bug where the sampling frequency is now read from the header
+%     file instead of it being fixed at 300 Hz.
+%
+
+function NSxPowerSpectrum(NSx, channelNumber, colorCode)
+
 if ~exist('colorCode', 'var')
     colorCode = 'b';
 end
@@ -7,7 +37,7 @@ function NSxPowerSpectrum(NSx, channelNumber, colorCode)
 x = double(NSx.Data(channelNumber,:));
 
 rng default;
-Fs = 300;
+Fs = NSx.MetaTags.SamplingFreq;
 t = linspace(0,1,length(x));
 
 N = length(x);
diff --git a/NPMK/Versions.txt b/NPMK/Versions.txt
index dbcbe3b..4cad264 100644
--- a/NPMK/Versions.txt
+++ b/NPMK/Versions.txt
@@ -449,5 +449,15 @@ NPMK Version 2.8.2.0: 5 May 2014
 %   - Fixed a bug where the response to 1/4 uV warning was not being saved.
 %
 
+***** NPMK Version 5.4.2.0 :October 2, 2020 *****
+%
+% 1.1.0.0: NSxPowerSpectrum: October 2, 2020
+%   - Fixed a bug where the sampling frequency is now read from the header
+%     file instead of it being fixed at 300 Hz.
+% 
+% 7.3.1.0: openNSx: October 2, 2020
+%   - If the units are in µV (openNSx('uv'), ths correct information is now 
+%     written to the electrodes header: 1000 nV (raw). 
+
 
-LATEST:5.4.1.0
\ No newline at end of file
+LATEST:5.4.2.0
\ No newline at end of file
diff --git a/NPMK/openNSx.m b/NPMK/openNSx.m
index 71d2442..16d4730 100644
--- a/NPMK/openNSx.m
+++ b/NPMK/openNSx.m
@@ -260,6 +260,9 @@
 %   - If the units are in "raw", ths correct information is now written to
 %     the electrodes header: 250 nV (raw). 
 %
+% 7.3.1.0: October 2, 2020
+%   - If the units are in µV (openNSx('uv'), ths correct information is now 
+%     written to the electrodes header: 1000 nV (raw). 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 %% Defining the NSx data structure and sub-branches.
@@ -530,7 +533,7 @@
 		NSx.ElectrodesInfo(headerIDX).MinAnalogValue = typecast(ExtendedHeader((27:28)+offset), 'int16');
 		NSx.ElectrodesInfo(headerIDX).MaxAnalogValue = typecast(ExtendedHeader((29:30)+offset), 'int16');
         if strcmpi(waveformUnits, 'uV')
-            NSx.ElectrodesInfo(headerIDX).AnalogUnits    = char(ExtendedHeader((31:46)+offset))';
+            NSx.ElectrodesInfo(headerIDX).AnalogUnits    = '1000 nV (raw)   ';
         else
             NSx.ElectrodesInfo(headerIDX).AnalogUnits    = '250 nV (raw)    ';
         end