diff --git a/gost.h b/gost.h
index f24dc5a3..fe6e1576 100644
--- a/gost.h
+++ b/gost.h
@@ -12,6 +12,7 @@
 NAMESPACE_BEGIN(CryptoPP)
 
 /// \brief GOST block cipher information
+/// \since Crypto++ 2.1
 struct GOST_Info : public FixedBlockSize<8>, public FixedKeyLength<32>
 {
 	CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "GOST";}
@@ -19,6 +20,7 @@ struct GOST_Info : public FixedBlockSize<8>, public FixedKeyLength<32>
 
 /// \brief GOST block cipher
 /// \sa <a href="http://www.cryptopp.com/wiki/GOST">GOST</a>
+/// \since Crypto++ 2.1
 class GOST : public GOST_Info, public BlockCipherDocumentation
 {
 	/// \brief GOST block cipher default operation
diff --git a/hmac.h b/hmac.h
index 8367517d..dc69606d 100644
--- a/hmac.h
+++ b/hmac.h
@@ -13,6 +13,7 @@ NAMESPACE_BEGIN(CryptoPP)
 
 /// \brief HMAC information
 /// \details HMAC_Base derives from VariableKeyLength and MessageAuthenticationCode
+/// \since Crypto++ 2.1
 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE HMAC_Base : public VariableKeyLength<16, 0, INT_MAX>, public MessageAuthenticationCode
 {
 public:
@@ -44,6 +45,7 @@ private:
 /// \details HMAC derives from MessageAuthenticationCodeImpl. It calculates the HMAC using
 ///   <tt>HMAC(K, text) = H(K XOR opad, H(K XOR ipad, text))</tt>.
 /// \sa <a href="http://www.weidai.com/scan-mirror/mac.html#HMAC">HMAC</a>
+/// \since Crypto++ 2.1
 template <class T>
 class HMAC : public MessageAuthenticationCodeImpl<HMAC_Base, HMAC<T> >
 {
diff --git a/luc.h b/luc.h
index 3d021461..d38d5611 100644
--- a/luc.h
+++ b/luc.h
@@ -5,6 +5,7 @@
 /// \details This class is here for historical and pedagogical interest. It has no practical advantages over other
 ///   trapdoor functions and probably shouldn't	be used in production software. The discrete log based LUC schemes
 ///   defined later in this .h file may be of more practical interest.
+/// \since Crypto++ 2.1
 
 #ifndef CRYPTOPP_LUC_H
 #define CRYPTOPP_LUC_H
@@ -33,6 +34,7 @@ NAMESPACE_BEGIN(CryptoPP)
 /// \details This class is here for historical and pedagogical interest. It has no practical advantages over other
 ///   trapdoor functions and probably shouldn't	be used in production software. The discrete log based LUC schemes
 ///   defined later in this .h file may be of more practical interest.
+/// \since Crypto++ 2.1
 class LUCFunction : public TrapdoorFunction, public PublicKey
 {
 	typedef LUCFunction ThisClass;
@@ -72,6 +74,7 @@ protected:
 /// \details This class is here for historical and pedagogical interest. It has no practical advantages over other
 ///   trapdoor functions and probably shouldn't	be used in production software. The discrete log based LUC schemes
 ///   defined later in this .h file may be of more practical interest.
+/// \since Crypto++ 2.1
 class InvertibleLUCFunction : public LUCFunction, public TrapdoorFunctionInverse, public PrivateKey
 {
 	typedef InvertibleLUCFunction ThisClass;
@@ -124,6 +127,7 @@ protected:
 };
 
 /// \brief LUC cryptosystem
+/// \since Crypto++ 2.1
 struct LUC
 {
 	static std::string StaticAlgorithmName() {return "LUC";}
@@ -136,6 +140,7 @@ struct LUC
 /// \details This class is here for historical and pedagogical interest. It has no practical advantages over other
 ///   trapdoor functions and probably shouldn't	be used in production software. The discrete log based LUC schemes
 ///   defined later in this .h file may be of more practical interest.
+/// \since Crypto++ 2.1
 template <class STANDARD>
 struct LUCES : public TF_ES<LUC, STANDARD>
 {
@@ -147,6 +152,7 @@ struct LUCES : public TF_ES<LUC, STANDARD>
 /// \details This class is here for historical and pedagogical interest. It has no practical advantages over other
 ///   trapdoor functions and probably shouldn't	be used in production software. The discrete log based LUC schemes
 ///   defined later in this .h file may be of more practical interest.
+/// \since Crypto++ 2.1
 template <class STANDARD, class H>
 struct LUCSS : public TF_SS<LUC, STANDARD, H>
 {
@@ -179,7 +185,8 @@ private:
 	Integer m_p;
 };
 
-/// _
+/// \brief LUC Precomputation
+/// \since Crypto++ 2.1
 class DL_BasePrecomputation_LUC : public DL_FixedBasePrecomputation<Integer>
 {
 public:
@@ -210,6 +217,7 @@ private:
 };
 
 /// \brief LUC GroupParameters specialization
+/// \since Crypto++ 2.1
 class DL_GroupParameters_LUC : public DL_GroupParameters_IntegerBasedImpl<DL_GroupPrecomputation_LUC, DL_BasePrecomputation_LUC>
 {
 public:
@@ -240,6 +248,7 @@ private:
 };
 
 /// \brief GF(p) group parameters that default to safe primes
+/// \since Crypto++ 2.1
 class DL_GroupParameters_LUC_DefaultSafePrime : public DL_GroupParameters_LUC
 {
 public:
@@ -250,6 +259,7 @@ protected:
 };
 
 /// \brief LUC HMP signature algorithm
+/// \since Crypto++ 2.1
 class DL_Algorithm_LUC_HMP : public DL_ElgamalLikeSignatureAlgorithm<Integer>
 {
 public:
@@ -265,6 +275,7 @@ public:
 };
 
 /// \brief LUC signature keys
+/// \since Crypto++ 2.1
 struct DL_SignatureKeys_LUC
 {
 	typedef DL_GroupParameters_LUC GroupParameters;
@@ -277,6 +288,7 @@ struct DL_SignatureKeys_LUC
 /// \details This class is here for historical and pedagogical interest. It has no practical advantages over other
 ///   trapdoor functions and probably shouldn't	be used in production software. The discrete log based LUC schemes
 ///   defined later in this .h file may be of more practical interest.
+/// \since Crypto++ 2.1
 template <class H>
 struct LUC_HMP : public DL_SS<DL_SignatureKeys_LUC, DL_Algorithm_LUC_HMP, DL_SignatureMessageEncodingMethod_DSA, H>
 {
@@ -296,7 +308,7 @@ struct DL_CryptoKeys_LUC
 /// \tparam DHAES_MODE flag indicating if the MAC includes additional context parameters such as <em>u·V</em>, <em>v·U</em> and label
 /// \tparam LABEL_OCTETS flag indicating if the label size is specified in octets or bits
 /// \sa CofactorMultiplicationOption
-/// \since Crypto++ 4.0, Crypto++ 5.7 for Bouncy Castle and Botan compatibility
+/// \since Crypto++ 2.1, Crypto++ 5.7 for Bouncy Castle and Botan compatibility
 template <class HASH = SHA1, class COFACTOR_OPTION = NoCofactorMultiplication, bool DHAES_MODE = true, bool LABEL_OCTETS = false>
 struct LUC_IES
 	: public DL_ES<
diff --git a/oaep.h b/oaep.h
index ec4172b2..76be7f24 100644
--- a/oaep.h
+++ b/oaep.h
@@ -1,3 +1,9 @@
+// oaep.h - originally written and placed in the public domain by Wei Dai
+
+/// \file oaep.h
+/// \brief Classes for optimal asymmetric encryption padding
+/// \since Crypto++ 2.1
+
 #ifndef CRYPTOPP_OAEP_H
 #define CRYPTOPP_OAEP_H
 
@@ -8,6 +14,7 @@
 NAMESPACE_BEGIN(CryptoPP)
 
 /// \brief OAEP padding base class
+/// \since Crypto++ 2.1
 class CRYPTOPP_DLL OAEP_Base : public PK_EncryptionMessageEncodingMethod
 {
 public:
@@ -23,7 +30,10 @@ protected:
 };
 
 /// \brief OAEP padding
+/// \tparam H HashTransformation derived class
+/// \tparam MGF MaskGeneratingFunction derived class
 /// \sa <a href="http://www.weidai.com/scan-mirror/ca.html#cem_OAEP-MGF1">EME-OAEP</a>, for use with classes derived from TF_ES
+/// \since Crypto++ 2.1
 template <class H, class MGF=P1363_MGF1>
 class OAEP : public OAEP_Base, public EncryptionStandard
 {
diff --git a/pssr.h b/pssr.h
index 377900ee..7122549d 100644
--- a/pssr.h
+++ b/pssr.h
@@ -2,6 +2,7 @@
 
 /// \file pssr.h
 /// \brief Classes for probablistic signature schemes
+/// \since Crypto++ 2.1
 
 #ifndef CRYPTOPP_PSSR_H
 #define CRYPTOPP_PSSR_H
@@ -17,6 +18,7 @@
 NAMESPACE_BEGIN(CryptoPP)
 
 /// \brief PSSR Message Encoding Method interface
+/// \since Crypto++ 2.1
 class CRYPTOPP_DLL PSSR_MEM_Base : public PK_RecoverableSignatureMessageEncodingMethod
 {
 public:
@@ -46,6 +48,7 @@ private:
 
 /// \brief PSSR Message Encoding Method with Hash Identifier
 /// \tparam USE_HASH_ID flag indicating whether the HashId is used
+/// \since Crypto++ 2.1
 template <bool USE_HASH_ID> class PSSR_MEM_BaseWithHashId;
 
 /// \brief PSSR Message Encoding Method with Hash Identifier
@@ -54,6 +57,7 @@ template<> class PSSR_MEM_BaseWithHashId<true> : public EMSA2HashIdLookup<PSSR_M
 
 /// \brief PSSR Message Encoding Method without Hash Identifier
 /// \details If USE_HASH_ID is false, then PSSR_MEM_Base is used for the base class
+/// \since Crypto++ 2.1
 template<> class PSSR_MEM_BaseWithHashId<false> : public PSSR_MEM_Base {};
 
 /// \brief PSSR Message Encoding Method
@@ -65,6 +69,7 @@ template<> class PSSR_MEM_BaseWithHashId<false> : public PSSR_MEM_Base {};
 /// \details If ALLOW_RECOVERY is true, the the signature scheme provides message recovery. If
 ///  ALLOW_RECOVERY is false, the the signature scheme is appendix, and the message must be
 ///  provided during verification.
+/// \since Crypto++ 2.1
 template <bool ALLOW_RECOVERY, class MGF=P1363_MGF1, int SALT_LEN=-1, int MIN_PAD_LEN=0, bool USE_HASH_ID=false>
 class PSSR_MEM : public PSSR_MEM_BaseWithHashId<USE_HASH_ID>
 {
@@ -80,6 +85,7 @@ public:
 /// \brief Probabilistic Signature Scheme with Recovery
 /// \details Signature Schemes with Recovery encode the message with the signature.
 /// \sa <a href="http://www.weidai.com/scan-mirror/sig.html#sem_PSSR-MGF1">PSSR-MGF1</a>
+/// \since Crypto++ 2.1
 struct PSSR : public SignatureStandard
 {
 	typedef PSSR_MEM<true> SignatureMessageEncodingMethod;
@@ -88,6 +94,7 @@ struct PSSR : public SignatureStandard
 /// \brief Probabilistic Signature Scheme with Appendix
 /// \details Signature Schemes with Appendix require the message to be provided during verification.
 /// \sa <a href="http://www.weidai.com/scan-mirror/sig.html#sem_PSS-MGF1">PSS-MGF1</a>
+/// \since Crypto++ 2.1
 struct PSS : public SignatureStandard
 {
 	typedef PSSR_MEM<false> SignatureMessageEncodingMethod;
diff --git a/ripemd.h b/ripemd.h
index e1f5081f..b5fbb4ae 100644
--- a/ripemd.h
+++ b/ripemd.h
@@ -13,6 +13,7 @@ NAMESPACE_BEGIN(CryptoPP)
 /// \brief RIPEMD-160 message digest
 /// \details Digest size is 160-bits.
 /// \sa <a href="http://www.weidai.com/scan-mirror/md.html#RIPEMD-160">RIPEMD-160</a>
+/// \since Crypto++ 2.1
 class RIPEMD160 : public IteratedHashWithStaticTransform<word32, LittleEndian, 64, 20, RIPEMD160>
 {
 public:
@@ -24,6 +25,7 @@ public:
 /// \brief RIPEMD-320 message digest
 /// \details Digest size is 320-bits.
 /// \sa <a href="http://www.weidai.com/scan-mirror/md.html#RIPEMD-320">RIPEMD-320</a>
+/// \since Crypto++ 2.1
 class RIPEMD320 : public IteratedHashWithStaticTransform<word32, LittleEndian, 64, 40, RIPEMD320>
 {
 public:
@@ -36,6 +38,7 @@ public:
 /// \details Digest size is 128-bits.
 /// \warning RIPEMD-128 is considered insecure, and should not be used unless you absolutely need it for compatibility.
 /// \sa <a href="http://www.weidai.com/scan-mirror/md.html#RIPEMD-128">RIPEMD-128</a>
+/// \since Crypto++ 2.1
 class RIPEMD128 : public IteratedHashWithStaticTransform<word32, LittleEndian, 64, 16, RIPEMD128>
 {
 public:
@@ -48,6 +51,7 @@ public:
 /// \details Digest size is 256-bits.
 /// \warning RIPEMD-256 is considered insecure, and should not be used unless you absolutely need it for compatibility.
 /// \sa <a href="http://www.weidai.com/scan-mirror/md.html#RIPEMD-256">RIPEMD-256</a>
+/// \since Crypto++ 2.1
 class RIPEMD256 : public IteratedHashWithStaticTransform<word32, LittleEndian, 64, 32, RIPEMD256>
 {
 public:
diff --git a/shark.h b/shark.h
index 4072667f..09459adc 100644
--- a/shark.h
+++ b/shark.h
@@ -2,6 +2,7 @@
 
 /// \file shark.h
 /// \brief Classes for the SHARK block cipher
+/// \since Crypto++ 2.1
 
 #ifndef CRYPTOPP_SHARK_H
 #define CRYPTOPP_SHARK_H
@@ -13,6 +14,7 @@
 NAMESPACE_BEGIN(CryptoPP)
 
 /// \brief SHARK block cipher information
+/// \since Crypto++ 2.1
 struct SHARK_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public VariableRounds<6, 2>
 {
 	CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "SHARK-E";}
@@ -20,9 +22,11 @@ struct SHARK_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public
 
 /// \brief SHARK block cipher
 /// <a href="http://www.cryptopp.com/wiki/SHARK-E">SHARK-E</a>
+/// \since Crypto++ 2.1
 class SHARK : public SHARK_Info, public BlockCipherDocumentation
 {
 	/// \brief SHARK block cipher default operation
+	/// \since Crypto++ 2.1
 	class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<SHARK_Info>
 	{
 	public:
@@ -34,6 +38,7 @@ class SHARK : public SHARK_Info, public BlockCipherDocumentation
 	};
 
 	/// \brief SHARK block cipher encryption operation
+	/// \since Crypto++ 2.1
 	class CRYPTOPP_NO_VTABLE Enc : public Base
 	{
 	public:
@@ -48,6 +53,7 @@ class SHARK : public SHARK_Info, public BlockCipherDocumentation
 	};
 
 	/// \brief SHARK block cipher decryption operation
+	/// \since Crypto++ 2.1
 	class CRYPTOPP_NO_VTABLE Dec : public Base
 	{
 	public:
diff --git a/tiger.h b/tiger.h
index aaca69a0..107a5d1c 100644
--- a/tiger.h
+++ b/tiger.h
@@ -1,3 +1,9 @@
+// tiger.h - originally written and placed in the public domain by Wei Dai
+
+/// \file tiger.h
+/// \brief Classes for the Tiger message digest
+/// \since Crypto++ 2.1
+
 #ifndef CRYPTOPP_TIGER_H
 #define CRYPTOPP_TIGER_H
 
@@ -12,7 +18,9 @@
 
 NAMESPACE_BEGIN(CryptoPP)
 
-/// <a href="http://www.cryptolounge.org/wiki/Tiger">Tiger</a>
+/// \brief Tiger message digest 
+/// \sa <a href="http://www.cryptolounge.org/wiki/Tiger">Tiger</a>
+/// \since Crypto++ 2.1
 class Tiger : public IteratedHashWithStaticTransform<word64, LittleEndian, 64, 24, Tiger>
 {
 public: