diff --git a/glib/gdatetime-private.c b/glib/gdatetime-private.c
index 19f575a7d..196f970ac 100644
--- a/glib/gdatetime-private.c
+++ b/glib/gdatetime-private.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2023 Philip Withnall
+ * Copyright 2023 GNOME Foundation Inc.
  *
  * SPDX-License-Identifier: LGPL-2.1-or-later
  *
@@ -15,6 +15,9 @@
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  - Philip Withnall <pwithnall@gnome.org>
  */
 
 #include "glib.h"
diff --git a/glib/gdatetime-private.h b/glib/gdatetime-private.h
index 3e804dd47..1513141ce 100644
--- a/glib/gdatetime-private.h
+++ b/glib/gdatetime-private.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2023 Philip Withnall
+ * Copyright 2023 GNOME Foundation Inc.
  *
  * SPDX-License-Identifier: LGPL-2.1-or-later
  *
@@ -15,6 +15,9 @@
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  - Philip Withnall <pwithnall@gnome.org>
  */
 
 #pragma once
diff --git a/glib/gdatetime.c b/glib/gdatetime.c
index 6543f32f6..f06caeff9 100644
--- a/glib/gdatetime.c
+++ b/glib/gdatetime.c
@@ -5,6 +5,7 @@
  * Copyright (C) 2010 Emmanuele Bassi <ebassi@linux.intel.com>
  * Copyright © 2010 Codethink Limited
  * Copyright © 2018 Tomasz Miąsko
+ * Copyright 2023 GNOME Foundation Inc.
  *
  * SPDX-License-Identifier: LGPL-2.1-or-later
  *
@@ -26,6 +27,7 @@
  *          Emmanuele Bassi <ebassi@linux.intel.com>
  *          Ryan Lortie <desrt@desrt.ca>
  *          Robert Ancell <robert.ancell@canonical.com>
+ *          Philip Withnall <pwithnall@gnome.org>
  */
 
 /* Algorithms within this file are based on the Calendar FAQ by
diff --git a/glib/tests/gdatetime.c b/glib/tests/gdatetime.c
index 802faf64f..61a54c682 100644
--- a/glib/tests/gdatetime.c
+++ b/glib/tests/gdatetime.c
@@ -1,7 +1,7 @@
 /* gdatetime-tests.c
  *
  * Copyright (C) 2009-2010 Christian Hergert <chris@dronelabs.com>
- * Copyright 2023 Philip Withnall
+ * Copyright 2023 GNOME Foundation Inc.
  *
  * SPDX-License-Identifier: LGPL-2.1-or-later
  *
@@ -17,6 +17,10 @@
  *
  * You should have received a copy of the GNU Lesser General Public License
  * along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  - Christian Hergert <chris@dronelabs.com>
+ *  - Philip Withnall <pwithnall@gnome.org>
  */
 
 #include "config.h"