diff --git a/lib/pem-packer.js b/lib/pem-packer.js
index aa1bb1b..db9946d 100644
--- a/lib/pem-packer.js
+++ b/lib/pem-packer.js
@@ -4,6 +4,7 @@ var PEM = module.exports;
 var Enc = require('./encoding.js');
 
 PEM.packBlock = function (opts) {
+  // TODO allow for headers?
   var n = opts.lineLength || 64;
   var re = new RegExp('.{1,' + n + '}', 'g');
   return '-----BEGIN ' + opts.type + '-----\n'