diff --git a/libs/pbd/glib_event_source.cc b/libs/pbd/glib_event_source.cc
index 59ae3d7c86..3f4c58c7a6 100644
--- a/libs/pbd/glib_event_source.cc
+++ b/libs/pbd/glib_event_source.cc
@@ -1,3 +1,21 @@
+/*
+ * Copyright (C) 2022 Paul Davis <paul@linuxaudiosystems.com>
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
 #include "pbd/glib_event_source.h"
 
 bool
diff --git a/libs/pbd/pbd/glib_event_source.h b/libs/pbd/pbd/glib_event_source.h
index 22400f0c53..b4b630486a 100644
--- a/libs/pbd/pbd/glib_event_source.h
+++ b/libs/pbd/pbd/glib_event_source.h
@@ -1,3 +1,21 @@
+/*
+ * Copyright (C) 2022 Paul Davis <paul@linuxaudiosystems.com>
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
 #ifndef __libpbd_glib_event_source_h__
 #define __libpbd_glib_event_source_h__