diff --git a/bin/wayback_machine_downloader b/bin/wayback_machine_downloader
index c4ef13f..0c35648 100755
--- a/bin/wayback_machine_downloader
+++ b/bin/wayback_machine_downloader
@@ -18,8 +18,8 @@ option_parser = OptionParser.new do |opts|
     options[:timestamp] = t
   end
 
-  opts.on("--accept-regex [ACCEPT_REGEX]", String,"Specify a regular expression to download. If a path doesn't meet this regex, it won't get downloaded.") do |accept_regex|
-    options[:accept_regex] = accept_regex
+  opts.on("-o", "--only ONLY_FILTER", String, "Restrict downloading to file urls matching the only filter supplied (use // notation for the only filter to be treated as a regex)") do |t|
+    options[:only_filter] = t
   end
 
   opts.on("-v", "--version", "Display version") do |t|
@@ -27,11 +27,8 @@ option_parser = OptionParser.new do |opts|
   end
 end.parse!
 
-# this used to be 0. we want to look at the /last/ option.
-# 
-# TODO: this argument needs to be handled better. argument handling is sorta messy.
 if base_url = ARGV[-1]
-  wayback_machine_downloader = WaybackMachineDownloader.new base_url: base_url, timestamp: options[:timestamp], accept_regex: options[:accept_regex]
+  wayback_machine_downloader = WaybackMachineDownloader.new base_url: base_url, timestamp: options[:timestamp], only_filter: options[:only_filter]
   wayback_machine_downloader.download_files
 elsif options[:version]
   puts WaybackMachineDownloader::VERSION