diff --git a/tools/goctl/internal/errorx/errorx.go b/tools/goctl/internal/errorx/errorx.go
index 26990b85..4d0e8707 100644
--- a/tools/goctl/internal/errorx/errorx.go
+++ b/tools/goctl/internal/errorx/errorx.go
@@ -12,6 +12,7 @@ var errorFormat = `goctl: generation error: %+v
 goctl version: %s
 %s`
 
+// GoctlError represents a goctl error.
 type GoctlError struct {
 	message []string
 	err     error
diff --git a/tools/goctl/internal/version/version.go b/tools/goctl/internal/version/version.go
index 11c0ae2e..20a32e24 100644
--- a/tools/goctl/internal/version/version.go
+++ b/tools/goctl/internal/version/version.go
@@ -5,7 +5,8 @@ import (
 	"strings"
 )
 
-const BuildVersion = "1.1.11-beta-2"
+// BuildVersion is the version of goctl.
+const BuildVersion = "1.2.0"
 
 // GetGoctlVersion returns BuildVersion
 func GetGoctlVersion() string {
diff --git a/zrpc/internal/serverinterceptors/tracinginterceptor.go b/zrpc/internal/serverinterceptors/tracinginterceptor.go
index b2fa6291..9ae9cdf1 100644
--- a/zrpc/internal/serverinterceptors/tracinginterceptor.go
+++ b/zrpc/internal/serverinterceptors/tracinginterceptor.go
@@ -8,7 +8,8 @@ import (
 	"google.golang.org/grpc/metadata"
 )
 
-// UnaryTracingInterceptor returns a func that handles tracing with given service name.
+// UnaryTracingInterceptor returns a grpc.UnaryServerInterceptor
+// that handles tracing with given service name.
 func UnaryTracingInterceptor(serviceName string) grpc.UnaryServerInterceptor {
 	return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo,
 		handler grpc.UnaryHandler) (resp interface{}, err error) {
@@ -28,6 +29,8 @@ func UnaryTracingInterceptor(serviceName string) grpc.UnaryServerInterceptor {
 	}
 }
 
+// StreamTracingInterceptor returns a grpc.StreamServerInterceptor
+// that handles tracing with given service name.
 func StreamTracingInterceptor(serviceName string) grpc.StreamServerInterceptor {
 	return func(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo,
 		handler grpc.StreamHandler) error {