Update RU/README.md

RU/README.md

@@ -26,6 +26,11 @@ to set
 
 -   the output path (pname_out)
 
+-   NOTE: if you want to generate a test plot in the same format as in
+    the documentation you will need to use addpath to define the path
+    to those functions in your environment (cris_ru_plot.m, 
+    rad2bt_l1b.m; located in the PLOT sub-directory)
+
 3.  Compare your output to sample output
 
 -   Sample radiometric uncertainty files that were generated from the