diff --git a/include/crypto/poly1305.h b/include/crypto/poly1305.h
index 5f0e7c714d..63d6600bdc 100644
--- a/include/crypto/poly1305.h
+++ b/include/crypto/poly1305.h
@@ -1,11 +1,10 @@
 /****************************************************************************
  * include/crypto/poly1305.h
- * $OpenBSD: poly1305.h,v 1.2 2020/07/22 13:54:30 tobhe Exp $
+ *
+ * SPDX-License-Identifier: NuttX-PublicDomain
  *
  * Public Domain poly1305 from Andrew Moon
  *
- * poly1305 implementation using 32 bit * 32 bit = 64 bit multiplication
- * and 64 bit addition from https://github.com/floodyberry/poly1305-donna
  ****************************************************************************/
 
 #ifndef __INCLUDE_CRYPTO_POLY1305_H