diff --git a/cffi-epoll.asd b/cffi-epoll.asd
index c9d9a24..c3bfeba 100644
--- a/cffi-epoll.asd
+++ b/cffi-epoll.asd
@@ -1,3 +1,20 @@
+;;
+;; cffi-epoll - Common Lisp wrapper for Linux epoll syscall
+;;
+;; Copyright 2017 Thomas de Grivel <thoxdg@gmail.com>
+;;
+;; Permission to use, copy, modify, and distribute this software for any
+;; purpose with or without fee is hereby granted, provided that the above
+;; copyright notice and this permission notice appear in all copies.
+;;
+;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+;; WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+;; MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+;; ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+;; WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+;; ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+;; OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+;;
(in-package :common-lisp-user)
diff --git a/cffi-epoll.lisp b/cffi-epoll.lisp
index 0a30696..a61d4f8 100644
--- a/cffi-epoll.lisp
+++ b/cffi-epoll.lisp
@@ -1,3 +1,20 @@
+;;
+;; cffi-epoll - Common Lisp wrapper for Linux epoll syscall
+;;
+;; Copyright 2017 Thomas de Grivel <thoxdg@gmail.com>
+;;
+;; Permission to use, copy, modify, and distribute this software for any
+;; purpose with or without fee is hereby granted, provided that the above
+;; copyright notice and this permission notice appear in all copies.
+;;
+;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+;; WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+;; MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+;; ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+;; WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+;; ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+;; OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+;;
(in-package :cffi-epoll)
diff --git a/grovel-epoll.lisp b/grovel-epoll.lisp
index a791111..e9935df 100644
--- a/grovel-epoll.lisp
+++ b/grovel-epoll.lisp
@@ -1,3 +1,20 @@
+;;
+;; cffi-epoll - Common Lisp wrapper for Linux epoll syscall
+;;
+;; Copyright 2017 Thomas de Grivel <thoxdg@gmail.com>
+;;
+;; Permission to use, copy, modify, and distribute this software for any
+;; purpose with or without fee is hereby granted, provided that the above
+;; copyright notice and this permission notice appear in all copies.
+;;
+;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+;; WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+;; MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+;; ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+;; WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+;; ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+;; OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+;;
(in-package :cffi-epoll)
diff --git a/package.lisp b/package.lisp
index 1d4cbeb..75d82c0 100644
--- a/package.lisp
+++ b/package.lisp
@@ -1,3 +1,20 @@
+;;
+;; cffi-epoll - Common Lisp wrapper for Linux epoll syscall
+;;
+;; Copyright 2017 Thomas de Grivel <thoxdg@gmail.com>
+;;
+;; Permission to use, copy, modify, and distribute this software for any
+;; purpose with or without fee is hereby granted, provided that the above
+;; copyright notice and this permission notice appear in all copies.
+;;
+;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+;; WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+;; MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+;; ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+;; WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+;; ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+;; OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+;;
(in-package :common-lisp)