diff --git a/src/cp437.c b/src/cp437.c
index 7305e207..719872f5 100644
--- a/src/cp437.c
+++ b/src/cp437.c
@@ -1,5 +1,7 @@
 /*
  * code page 437 to unicode map
+ *
+ * This file may be distributed under the terms of the GNU LGPLv3 license.
  */
 
 #include "types.h"