bin/parse in parse_a_changelog-1.0.0 vs bin/parse in parse_a_changelog-1.0.1

@@ -1,8 +1,15 @@
 #!/usr/bin/env ruby
 
 require_relative '../lib/parse_a_changelog.rb'
 
+if ARGV.empty? || ARGV[0].empty?
+  puts "usage: parse <changelog file>"
+  exit 1
+else
+  puts "Parsing #{ARGV[0]}"
+end
+
 begin
   ParseAChangelog.parse(ARGV[0])
   puts "SUCCESS"
 rescue ParseAChangelog::ParseError => e
   puts "ERROR: #{e.to_s}"