Update README.md

Author: etfovac

README.md

@@ -2,6 +2,8 @@
 
 Display signals with scope's persistence effect in LabVIEW's waveform graph
 
+Published also as a [NI Example](https://forums.ni.com/t5/Example-Code/Persistence-effect-in-waveform-graph/ta-p/4168343)
+
 ### Table of Contents (Wiki)
 [Wiki Home](https://github.com/etfovac/lv_plot_persistence/wiki)  
 [Overview](https://github.com/etfovac/lv_plot_persistence/wiki/Overview)  
@@ -17,4 +19,8 @@ Display signals with scope's persistence effect in LabVIEW's waveform graph
 <img src="./graphics/2021-07-30_010201.png" alt="Persistence_FP">   
 <img src="./graphics/2021-07-30_010242.png" alt="Persistence_FP">   
 
+### Palette  
+There is a custom PlotColor.vi that generates a palette for each buffered signal. 
+It can switch from RGB-White to RGB-Black scale.
+
 [lv_plot_persistence](https://github.com/etfovac/lv_plot_persistence) is maintained by [etfovac](https://github.com/etfovac).