diff --git a/src/AudioAnalysisTools/DSP/PowerSpectralDensity.cs b/src/AudioAnalysisTools/DSP/PowerSpectralDensity.cs
index ea21d80e0..fe30c6bd2 100644
--- a/src/AudioAnalysisTools/DSP/PowerSpectralDensity.cs
+++ b/src/AudioAnalysisTools/DSP/PowerSpectralDensity.cs
@@ -17,6 +17,7 @@ public static class PowerSpectralDensity
     {
         /// <summary>
         /// Square the FFT coefficients >> this gives an energy spectrogram.
+        /// MatrixTools.SquareValues is doing the same!
         /// </summary>
         public static double[,] GetEnergyValues(double[,] fftCoefficients)
         {
@@ -34,6 +35,7 @@ public static class PowerSpectralDensity
 
         /// <summary>
         /// Take average of the energy values in each frequency bin to obtain power spectrum or PSD.
+        /// SpectrogramTools.CalculateAvgSpectrumFromEnergySpectrogram is doing the same!
         /// </summary>
         public static double[] GetPowerSpectrum(double[,] energySpectrogram)
         {
diff --git a/tests/Acoustics.Test/AudioAnalysisTools/DSP/KmeansClusteringTests.cs b/tests/Acoustics.Test/AudioAnalysisTools/DSP/KmeansClusteringTests.cs
index bea0ae5bc..91fe7832f 100644
--- a/tests/Acoustics.Test/AudioAnalysisTools/DSP/KmeansClusteringTests.cs
+++ b/tests/Acoustics.Test/AudioAnalysisTools/DSP/KmeansClusteringTests.cs
@@ -26,7 +26,6 @@ public class KmeansClusteringTests
         private DirectoryInfo outputDirectory;
 
         [TestInitialize]
-
         public void Setup()
         {
             this.outputDirectory = PathHelper.GetTempDir();