diff --git a/bin/jekyll b/bin/jekyll
index 3f2988bc..6c968cec 100755
--- a/bin/jekyll
+++ b/bin/jekyll
@@ -29,6 +29,7 @@ Mercenary.program(:jekyll) do |p|
 
   p.action do |args, options|
     if args.empty?
+      Jekyll.logger.error "A subcommand is required."
       puts p
     else
       unless p.has_command?(args.first)