diff --git a/Rakefile b/Rakefile
index 436f533..64d5352 100644
--- a/Rakefile
+++ b/Rakefile
@@ -17,7 +17,7 @@ RDOC_OPTS = ['--quiet', '--title', "Camping, the Documentation",
     "--inline-source"]
 
 desc "Packages up Camping."
-task :default => [:package]
+task :default => [:size, :package]
 task :package => [:clean]
 
 task :doc => [:before_doc, :rdoc, :after_doc]
@@ -128,3 +128,16 @@ task :diff do
   sh "diff -u .camping-unabridged.pt .camping.pt | less"
 end
 
+SIZE_LIMIT = 4096
+desc "Compare camping sizes to unabridged"
+task :size do
+  size = File.size("lib/camping-unabridged.rb")
+  FileList["lib/camping*.rb"].each do |path|
+    s = File.size(path)
+    puts "%21s : % 6d % 4d%" % [File.basename(path), s, (100 * s / size)]
+  end
+  if File.size("lib/camping.rb") > SIZE_LIMIT
+    STDERR.puts "ERROR: camping.rb is too big (> #{SIZE_LIMIT})"
+    exit 1
+  end
+end