diff --git a/COPYRIGHT b/COPYRIGHT
index 4cc6f0751d05b50dc2010edac86a7f5135a0dee8..e07932b4c761214bd4d5278bb583a604b0035e25 100644
--- a/COPYRIGHT
+++ b/COPYRIGHT
@@ -1,3 +1,10 @@
+The diceware idea Copyright(C) 1995-2014, Arnold G. Reinhold,
+Cambridge, Massachusetts USA.
+
+The English Diceware Wordlist used with this programme is licensed by
+Arnold G. Reinhold under the `Creative Commons CC-BY 3.0` (see
+http://creativecommons.org/licenses/by/3.0/) license.
+
 diceware -- Python implementation
 Copyright (C) 2015 Uli Fouquet