diff --git a/crypto/ivgenpriv.h b/crypto/ivgenpriv.h
index 28e5c67..cecdbed 100644
--- a/crypto/ivgenpriv.h
+++ b/crypto/ivgenpriv.h
@@ -6,7 +6,7 @@
  * This library 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of