diff --git a/rijndael.h b/rijndael.h
index f6ab5bdb..8f3968b5 100644
--- a/rijndael.h
+++ b/rijndael.h
@@ -4,6 +4,7 @@
 //! \brief Classes for Rijndael encryption algorithm
 //! \details All key sizes are supported. The library only provides Rijndael with 128-bit blocks,
 //!   and not 192-bit or 256-bit blocks
+//! \since Rijndael since Crypto++ 3.2, Intel AESNI since Crypto++ 5.6.1, ARMv8 AES since Crypto++ 6.0
 
 #ifndef CRYPTOPP_RIJNDAEL_H
 #define CRYPTOPP_RIJNDAEL_H