diff --git a/css-parser.asd b/css-parser.asd
index d959968..4dac5ee 100644
--- a/css-parser.asd
+++ b/css-parser.asd
@@ -1,3 +1,5 @@
+;; css-parser - CSS parser for cl-stream
+;; Copyright 2018,2019,2022 Thomas de Grivel <thoxdg@gmail.com>
(in-package :common-lisp-user)
diff --git a/css-parser.lisp b/css-parser.lisp
index e4fd5e0..dc42792 100644
--- a/css-parser.lisp
+++ b/css-parser.lisp
@@ -1,3 +1,5 @@
+;; css-parser - CSS parser for cl-stream
+;; Copyright 2018,2019,2022 Thomas de Grivel <thoxdg@gmail.com>
(in-package :css-parser)
diff --git a/package.lisp b/package.lisp
index 338039c..f0c6f3f 100644
--- a/package.lisp
+++ b/package.lisp
@@ -1,3 +1,5 @@
+;; css-parser - CSS parser for cl-stream
+;; Copyright 2018,2019,2022 Thomas de Grivel <thoxdg@gmail.com>
(in-package :common-lisp-user)
diff --git a/test.lisp b/test.lisp
index 25cb401..3753ea0 100644
--- a/test.lisp
+++ b/test.lisp
@@ -1,3 +1,5 @@
+;; css-parser - CSS parser for cl-stream
+;; Copyright 2018,2019,2022 Thomas de Grivel <thoxdg@gmail.com>
(in-package :common-lisp-user)