diff --git a/chain/chain.go b/chain/chain.go
index 53b42f5..ace6692 100644
--- a/chain/chain.go
+++ b/chain/chain.go
@@ -152,7 +152,7 @@ func (c *ChainSDK) GetTokenSymbol() string {
 	return c.tokenSymbol
 }
 
-func (c *ChainSDK) GetCharacterName() string {
+func (c *ChainSDK) GetRoleName() string {
 	return c.name
 }
 
diff --git a/config/config.go b/config/config.go
index 9320305..735ec64 100644
--- a/config/config.go
+++ b/config/config.go
@@ -36,13 +36,13 @@ const (
 // NewSDK constructs a new client from the Config.
 //
 // This function consumes the config. Do not reuse it (really!).
-func (cfg *Config) NewSDK(characterName string) (sdk.SDK, error) {
-	if characterName != CharacterName_Bucket &&
-		characterName != CharacterName_Deoss &&
-		characterName != CharacterName_Client {
+func (cfg *Config) NewSDK(roleName string) (sdk.SDK, error) {
+	if roleName != CharacterName_Bucket &&
+		roleName != CharacterName_Deoss &&
+		roleName != CharacterName_Client {
 		return nil, fmt.Errorf("invalid character name")
 	}
-	return chain.NewChainSDK(characterName, cfg.Rpc, cfg.Mnemonic, cfg.Timeout)
+	return chain.NewChainSDK(roleName, cfg.Rpc, cfg.Mnemonic, cfg.Timeout)
 }
 
 // Apply applies the given options to the config, returning the first error
diff --git a/core/sdk/sdk.go b/core/sdk/sdk.go
index f68952f..6f443a7 100644
--- a/core/sdk/sdk.go
+++ b/core/sdk/sdk.go
@@ -162,8 +162,11 @@ type SDK interface {
 	// SetChainState sets the state of the chain node.
 	SetChainState(state bool)
 
-	// GetCharacterName returns the character name.
-	GetCharacterName() string
+	// GetRoleName returns the role name.
+	GetRoleName() string
+
+	// GetTokenSymbol returns the token symbol
+	GetTokenSymbol() string
 
 	// Reconnect for reconnecting chains.
 	Reconnect() error
diff --git a/defaults.go b/defaults.go
index 092f684..0368e7f 100644
--- a/defaults.go
+++ b/defaults.go
@@ -9,7 +9,7 @@ package sdkgo
 
 import "github.com/CESSProject/sdk-go/core/pattern"
 
-// DefaultRpcAddrs configures client to use default RPC address.
+// DefaultRpcAddrs configures the default rpc address
 var DefaultRpcAddrs = func(cfg *Config) error {
 	rpcAddrs := []string{
 		"wss://testnet-rpc0.cess.cloud/ws/",
@@ -18,15 +18,12 @@ var DefaultRpcAddrs = func(cfg *Config) error {
 	return cfg.Apply(ConnectRpcAddrs(rpcAddrs))
 }
 
-// DefaultListenPort configures client to use default listen port.
+// DefaultTimeout configures the default transaction waiting timeout
 var DefaultTimeout = func(cfg *Config) error {
 	return cfg.Apply(TransactionTimeout(pattern.BlockInterval))
 }
 
 // Complete list of default options and when to fallback on them.
-//
-// Please *DON'T* specify default options any other way. Putting this all here
-// makes tracking defaults *much* easier.
 var defaults = []struct {
 	fallback func(cfg *Config) bool
 	opt      Option
diff --git a/examples.go b/examples.go
index 4c7f53e..dd4284c 100644
--- a/examples.go
+++ b/examples.go
@@ -36,7 +36,7 @@ func Example_RegisterDeoss() {
 	if err != nil {
 		panic(err)
 	}
-	txhash, _, err := cli.Register(cli.GetCharacterName(), cli.GetSignatureAccPulickey(), "", 0)
+	txhash, _, err := cli.Register(cli.GetRoleName(), cli.GetSignatureAccPulickey(), "", 0)
 	if err != nil {
 		panic(err)
 	}
@@ -53,7 +53,7 @@ func Example_RegisterStorageNode() {
 	if err != nil {
 		panic(err)
 	}
-	txhash, _, err := cli.Register(cli.GetCharacterName(), cli.GetSignatureAccPulickey(), "cXxxx...xxx", 100000)
+	txhash, _, err := cli.Register(cli.GetRoleName(), cli.GetSignatureAccPulickey(), "cXxxx...xxx", 100000)
 	if err != nil {
 		panic(err)
 	}
diff --git a/options.go b/options.go
index 044c991..eedbdc4 100644
--- a/options.go
+++ b/options.go
@@ -13,8 +13,7 @@ import (
 	"github.com/CESSProject/sdk-go/core/pattern"
 )
 
-// ConnectRpcAddrs configures client to connect to the given RPC
-// addresses.
+// ConnectRpcAddrs configuration rpc address
 func ConnectRpcAddrs(s []string) Option {
 	return func(cfg *Config) error {
 		cfg.Rpc = s
@@ -22,7 +21,7 @@ func ConnectRpcAddrs(s []string) Option {
 	}
 }
 
-// Workspace configures client to use the given workspace.
+// Mnemonic configures the mnemonic of the signature account
 func Mnemonic(mnemonic string) Option {
 	return func(cfg *Config) error {
 		cfg.Mnemonic = mnemonic
@@ -30,7 +29,7 @@ func Mnemonic(mnemonic string) Option {
 	}
 }
 
-// TransactionTimeout configures the transaction timeout period.
+// TransactionTimeout configures the waiting timeout for a transaction
 func TransactionTimeout(timeout time.Duration) Option {
 	return func(cfg *Config) error {
 		if timeout < pattern.BlockInterval {