diff --git a/crypto/poly1305.c b/crypto/poly1305.c
index fbd7f13a6a..bd34582ba5 100644
--- a/crypto/poly1305.c
+++ b/crypto/poly1305.c
@@ -1,11 +1,10 @@
 /****************************************************************************
  * crypto/poly1305.c
  *
- * $OpenBSD: poly1305.c,v 1.2 2020/07/22 13:54:30 tobhe Exp $
+ * SPDX-License-Identifier: NuttX-PublicDomain
  *
  * Public Domain poly1305 from Andrew Moon
- * Based on poly1305-donna.c, poly1305-donna-32.h and poly1305-donna.h from:
- *   https://github.com/floodyberry/poly1305-donna
+ *
  ****************************************************************************/
 
 /****************************************************************************