diff --git a/demo.R b/demo.R
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+# author: Tiffany Timbers
+# date: 2020-01-15
+
+"This script prints out docopt args.
+Usage: demo.R <arg1> --arg2=<arg2> [--arg3=<arg3>] [<arg4>]
+
+Options:
+<arg>             Takes any value (this is a required positional argument)
+--arg2=<arg2>     Takes any value (this is a required option)
+[--arg3=<arg3>]   Takes any value (this is an optional option)
+[<arg4>]          Takes any value (this is an optional positional argument)
+" -> doc
+
+library(docopt)
+opt <- docopt(doc)
+
+main <- function(opt, arg4){
+    print(opt)
+    print(typeof(opt))
+    print(paste0("The value for arg4 is ",arg4, " and the type of arg4 is ", typeof(arg4)))
+}
+
+main(opt, opt$arg4)
+