diff --git a/src/cairo-output-stream.c b/src/cairo-output-stream.c
index 4032c393b..de92fa4e8 100644
--- a/src/cairo-output-stream.c
+++ b/src/cairo-output-stream.c
@@ -164,6 +164,10 @@ _cairo_output_stream_write_hex_string (cairo_output_stream_t *stream,
 /* Format a double in a locale independent way and trim trailing
  * zeros.  Based on code from Alex Larson <alexl@redhat.com>.
  * http://mail.gnome.org/archives/gtk-devel-list/2001-October/msg00087.html
+ *
+ * The code in the patch is copyright Red Hat, Inc under the LGPL, but
+ * has been relicensed under the LGPL/MPL dual license for inclusion
+ * into cairo (see COPYING). -- Kristian Høgsberg <krh@redhat.com>
  */
 
 int