diff --git a/paper.tex b/paper.tex
index 61d9c1c..83b316b 100644
--- a/paper.tex
+++ b/paper.tex
@@ -424,8 +424,10 @@ \subsection{Figures}
 \paragraph{Color Scheme} 
 
 In Figures we use a color scheme that is print-friendly and also visible
-with red-green blindness. The following colors are all print-friendly
-and red-green save when only using Color 1-4:
+with red-green blindness. When presenting qualitative data (unrelated data
+not a transition from one extreme to another) we use the following
+colors,\footnote{\url{https://colorbrewer2.org/\#type=qualitative&scheme=Paired&n=6}}
+that are all print-friendly and red-green save when only using Color 1-4:
 
 \medskip
 {