diff --git a/Rakefile b/Rakefile
new file mode 100644
index 0000000..673b273
--- /dev/null
+++ b/Rakefile
@@ -0,0 +1,11 @@
+require "date"
+
+namespace :appcache do
+  desc "update the date in the appcache file (in the gh-pages branch)"
+  task :update do
+    appcache = File.read("cache.appcache")
+    updated  = "# Updated: #{DateTime.now}\n"
+
+    File.write("cache.appcache", appcache.sub(/\A(#.*$\n)?/, updated))
+  end
+end