--- crdt.el	2020-10-04 19:59:06.345935516 -0500
+++ crdt.el	2020-10-04 20:06:29.778398189 -0500
@@ -1,3 +1,24 @@
+;;; crdt.el: collaborative editing using Conflict-free Replicated Data Types
+;; 
+;; Copyright (C) 2020 Qiantan Hong
+;; 
+;; Author: Qiantan Hong <qhong@mit.edu>
+;; Maintainer: Qiantan Hong <qhong@mit.edu>
+;; Keywords: collaboration crdt
+;; 
+;; CRDT is is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+;; 
+;; CRDT is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;; 
+;; You should have received a copy of the GNU General Public License
+;; along with CRDT.  If not, see <https://www.gnu.org/licenses/>.
+
 (require 'cl-lib)
 
 ;; Loogoot split algorithm