diff --git a/README.md b/README.md
index 6fff666131cb4546761b7913d84366e85d459e6e..8b797c252131f53dcc32ae109597d82afbe37b38 100644
--- a/README.md
+++ b/README.md
@@ -8,4 +8,6 @@ Referencias:
 
 [4] https://observablehq.com/@d3/histogram/2
 
-[5] https://observablehq.com/@d3/kernel-density-estimation
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+[5] https://observablehq.com/@d3/kernel-density-estimation
+
+[6] https://matplotlib.org/stable/gallery/color/named_colors.html
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