diff --git a/user/handler/handler.go b/user/handler/handler.go
index 6ef3408..e438a8c 100644
--- a/user/handler/handler.go
+++ b/user/handler/handler.go
@@ -200,6 +200,7 @@ func (s *User) Login(ctx context.Context, req *pb.LoginRequest, rsp *pb.LoginRes
 		Id:      random(128),
 		Created: time.Now().Unix(),
 		Expires: time.Now().Add(time.Hour * 24 * 7).Unix(),
+		UserId:  accounts[0].Id,
 	}
 
 	if err := s.domain.CreateSession(ctx, sess); err != nil {
diff --git a/user/proto/user.pb.go b/user/proto/user.pb.go
index dc4853f..35f7879 100644
--- a/user/proto/user.pb.go
+++ b/user/proto/user.pb.go
@@ -136,6 +136,8 @@ type Session struct {
 
 	// the session id
 	Id string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	// the associated user id
+	UserId string `protobuf:"bytes,2,opt,name=userId,proto3" json:"userId,omitempty"`
 	// unix timestamp
 	Created int64 `protobuf:"varint,4,opt,name=created,proto3" json:"created,omitempty"`
 	// unix timestamp
@@ -181,6 +183,13 @@ func (x *Session) GetId() string {
 	return ""
 }
 
+func (x *Session) GetUserId() string {
+	if x != nil {
+		return x.UserId
+	}
+	return ""
+}
+
 func (x *Session) GetCreated() int64 {
 	if x != nil {
 		return x.Created
@@ -195,13 +204,13 @@ func (x *Session) GetExpires() int64 {
 	return 0
 }
 
-// Create a new user account
+// Create a new user account. The email address and username for the account must be unique.
 type CreateRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// the acccount id
+	// optional acccount id
 	Id string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
 	// the username
 	Username string `protobuf:"bytes,2,opt,name=username,proto3" json:"username,omitempty"`
@@ -209,7 +218,7 @@ type CreateRequest struct {
 	Email string `protobuf:"bytes,3,opt,name=email,proto3" json:"email,omitempty"`
 	// the user password
 	Password string `protobuf:"bytes,4,opt,name=password,proto3" json:"password,omitempty"`
-	// the user profile as map<string,string>
+	// optional user profile as map<string,string>
 	Profile map[string]string `protobuf:"bytes,5,rep,name=profile,proto3" json:"profile,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
@@ -414,16 +423,18 @@ func (*DeleteResponse) Descriptor() ([]byte, []int) {
 	return file_proto_user_proto_rawDescGZIP(), []int{5}
 }
 
-// Read an account by id
+// Read an account by id, username or email. Only one need to be specified.
 type ReadRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
 	// the account id
-	Id       string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	Id string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	// the account username
 	Username string `protobuf:"bytes,2,opt,name=username,proto3" json:"username,omitempty"`
-	Email    string `protobuf:"bytes,3,opt,name=email,proto3" json:"email,omitempty"`
+	// the account password
+	Email string `protobuf:"bytes,3,opt,name=email,proto3" json:"email,omitempty"`
 }
 
 func (x *ReadRequest) Reset() {
@@ -754,12 +765,13 @@ func (*UpdatePasswordResponse) Descriptor() ([]byte, []int) {
 	return file_proto_user_proto_rawDescGZIP(), []int{11}
 }
 
-// Read a session by id
+// Read a session by the session id. In the event it has expired or is not found and error is returned.
 type ReadSessionRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
+	// The unique session id
 	SessionId string `protobuf:"bytes,1,opt,name=sessionId,proto3" json:"sessionId,omitempty"`
 }
 
@@ -849,14 +861,18 @@ func (x *ReadSessionResponse) GetSession() *Session {
 	return nil
 }
 
-// Login a user account
+// Login using username or email. The response will return a new session for successful login,
+// 401 in the case of login failure and 500 for any other error
 type LoginRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
+	// The username of the user
 	Username string `protobuf:"bytes,1,opt,name=username,proto3" json:"username,omitempty"`
-	Email    string `protobuf:"bytes,2,opt,name=email,proto3" json:"email,omitempty"`
+	// The email address of the user
+	Email string `protobuf:"bytes,2,opt,name=email,proto3" json:"email,omitempty"`
+	// The password of the user
 	Password string `protobuf:"bytes,3,opt,name=password,proto3" json:"password,omitempty"`
 }
 
@@ -918,6 +934,7 @@ type LoginResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
+	// The session of the logged in  user
 	Session *Session `protobuf:"bytes,1,opt,name=session,proto3" json:"session,omitempty"`
 }
 
@@ -1046,11 +1063,13 @@ func (*LogoutResponse) Descriptor() ([]byte, []int) {
 	return file_proto_user_proto_rawDescGZIP(), []int{17}
 }
 
+// Verify the email address of an account from a token sent in an email to the user.
 type VerifyEmailRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
+	// The token from the verification email
 	Token string `protobuf:"bytes,1,opt,name=token,proto3" json:"token,omitempty"`
 }
 
@@ -1290,150 +1309,152 @@ var file_proto_user_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/user/proto/user.proto b/user/proto/user.proto
index 7b3d18f..439aa65 100644
--- a/user/proto/user.proto
+++ b/user/proto/user.proto
@@ -37,6 +37,8 @@ message Account {
 message Session {
 	// the session id
 	string id = 1;
+	// the associated user id
+	string userId = 2;
 	// unix timestamp
 	int64 created = 4;
 	// unix timestamp