diff --git a/r.md b/r.md
index 65a5260..bb60fc1 100644
--- a/r.md
+++ b/r.md
@@ -43,3 +43,7 @@ for (i in dim1) {
 
 to run a script from the command line
 `R --vanilla < scriptfile.R`
+
+listing of R colors:
+http://www.endmemo.com/r/color.php
+