diff --git a/src/util.cr b/src/util.cr
index 36a7791..e6008fb 100644
--- a/src/util.cr
+++ b/src/util.cr
@@ -35,6 +35,12 @@ def send_json(env, json)
   env.response.print json
 end
 
+def send_attachment(env, path)
+  MIME.register ".cbz", "application/vnd.comicbook+zip"
+  MIME.register ".cbr", "application/vnd.comicbook-rar"
+  send_file env, path, filename: File.basename(path), disposition: "attachment"
+end
+
 def hash_to_query(hash)
   hash.map { |k, v| "#{k}=#{v}" }.join("&")
 end