diff --git a/server/pkg/api/server.go b/server/pkg/api/server.go
index a382e0d..5629b10 100644
--- a/server/pkg/api/server.go
+++ b/server/pkg/api/server.go
@@ -13,6 +13,7 @@ import (
 	"google.golang.org/grpc"
 )
 
+// ShoesLXDMultiServer implement gRPC server
 type ShoesLXDMultiServer struct {
 	pb.UnimplementedShoesLXDMultiServer
 
diff --git a/server/pkg/api/server_add_instance.go b/server/pkg/api/server_add_instance.go
index 9eadb9e..0fac663 100644
--- a/server/pkg/api/server_add_instance.go
+++ b/server/pkg/api/server_add_instance.go
@@ -19,6 +19,7 @@ import (
 	"google.golang.org/grpc/status"
 )
 
+// AddInstance add instance to LXD server
 func (s *ShoesLXDMultiServer) AddInstance(ctx context.Context, req *pb.AddInstanceRequest) (*pb.AddInstanceResponse, error) {
 	log.Printf("AddInstance req: %+v\n", req)
 	if _, err := runner.ToUUID(req.RunnerName); err != nil {
@@ -133,6 +134,7 @@ func (s *ShoesLXDMultiServer) scheduleHost(targetLXDHosts []lxdclient.LXDHost) (
 }
 
 var (
+	// ErrNoValidHost is not valid host in targets
 	ErrNoValidHost = fmt.Errorf("no valid host in targets")
 )
 
diff --git a/server/pkg/api/server_delete_instance.go b/server/pkg/api/server_delete_instance.go
index b41b0d7..122c5a6 100644
--- a/server/pkg/api/server_delete_instance.go
+++ b/server/pkg/api/server_delete_instance.go
@@ -12,6 +12,7 @@ import (
 	"google.golang.org/grpc/status"
 )
 
+// DeleteInstance delete instance to LXD server
 func (s *ShoesLXDMultiServer) DeleteInstance(ctx context.Context, req *pb.DeleteInstanceRequest) (*pb.DeleteInstanceResponse, error) {
 	log.Printf("DeleteInstance req: %+v\n", req)
 	if _, err := runner.ToUUID(req.CloudId); err != nil {
diff --git a/server/pkg/config/config_hostconfig.go b/server/pkg/config/config_hostconfig.go
index 41bddbd..0d0d84a 100644
--- a/server/pkg/config/config_hostconfig.go
+++ b/server/pkg/config/config_hostconfig.go
@@ -13,16 +13,20 @@ type HostConfigMap struct {
 	s sync.Map
 }
 
+// ErrHostNotFound is error message for host config is not found
 var ErrHostNotFound = fmt.Errorf("host config is not found")
 
+// NewHostConfigMap create config map for host config
 func NewHostConfigMap() *HostConfigMap {
 	return &HostConfigMap{}
 }
 
+// Store host config
 func (s *HostConfigMap) Store(lxdAPIAddress string, hostConfig HostConfig) {
 	s.s.Store(lxdAPIAddress, hostConfig)
 }
 
+// Load host config
 func (s *HostConfigMap) Load(lxdAPIAddress string) (*HostConfig, error) {
 	v, ok := s.s.Load(lxdAPIAddress)
 	if !ok {
@@ -37,6 +41,7 @@ func (s *HostConfigMap) Load(lxdAPIAddress string) (*HostConfig, error) {
 	return &t, nil
 }
 
+// Range host config
 func (s *HostConfigMap) Range(f func(key string, value HostConfig) bool) {
 	s.s.Range(func(key, value interface{}) bool {
 		k := key.(string)
diff --git a/server/pkg/lxdclient/connect.go b/server/pkg/lxdclient/connect.go
index d9ea4df..27e35da 100644
--- a/server/pkg/lxdclient/connect.go
+++ b/server/pkg/lxdclient/connect.go
@@ -38,6 +38,7 @@ func ConnectLXDs(hostConfigs []config.HostConfig) ([]LXDHost, error) {
 }
 
 var (
+	// ErrTimeoutConnectLXD is error message for timeout of ConnectLXD
 	ErrTimeoutConnectLXD = fmt.Errorf("timeout of ConnectLXD")
 )
 
diff --git a/shoes-lxd-multi/main.go b/shoes-lxd-multi/main.go
index 97c51b0..152863d 100644
--- a/shoes-lxd-multi/main.go
+++ b/shoes-lxd-multi/main.go
@@ -17,7 +17,9 @@ import (
 )
 
 const (
-	EnvTargetHosts    = "LXD_MULTI_TARGET_HOSTS"
+	// EnvTargetHosts is list of target host
+	EnvTargetHosts = "LXD_MULTI_TARGET_HOSTS"
+	// EnvServerEndpoint is endpoint of server
 	EnvServerEndpoint = "LXD_MULTI_SERVER_ENDPOINT"
 )