diff --git a/libswresample/dither_template.c b/libswresample/dither_template.c
index 1e35dfb040..1f535de3dc 100644
--- a/libswresample/dither_template.c
+++ b/libswresample/dither_template.c
@@ -1,3 +1,20 @@
+/*
+ * This file is part of libswresample
+ *
+ * libswresample is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * libswresample 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with libswresample; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
 
 #if defined(TEMPLATE_DITHER_DBL)
 #    define RENAME(N) N ## _double