diff --git a/README.MD b/README.MD
index 9044afc24..58820a37e 100644
--- a/README.MD
+++ b/README.MD
@@ -41,7 +41,7 @@ go get -u -v github.com/gogf/gf/v2
 ## cli tool
 
 ```bash
-go install github.com/gogf/gf/cmd/gf/v2
+go install github.com/gogf/gf/cmd/gf/v2@latest
 ```
 
 # Limitation
diff --git a/cmd/gf/README.MD b/cmd/gf/README.MD
index 4c1ec0573..863644d44 100644
--- a/cmd/gf/README.MD
+++ b/cmd/gf/README.MD
@@ -37,7 +37,8 @@ You can also install `gf` tool using pre-built binaries: <https://github.com/gog
 ## 2) Manually Install
 
 ```shell
-go install github.com/gogf/gf/cmd/gf/v2
+go install github.com/gogf/gf/cmd/gf/v2@latest # latest version
+go install github.com/gogf/gf/cmd/gf/v2@v2.5.5 # certain version(should be >= v2.5.5)
 ```
 
 ## 2. Commands
diff --git a/contrib/rpc/grpcx/grpcx_interceptor_server.go b/contrib/rpc/grpcx/grpcx_interceptor_server.go
index 9feed8916..29b922b29 100644
--- a/contrib/rpc/grpcx/grpcx_interceptor_server.go
+++ b/contrib/rpc/grpcx/grpcx_interceptor_server.go
@@ -88,6 +88,7 @@ func (s modServer) UnaryAllowNilRes(
 }
 
 // UnaryTracing is a unary interceptor for adding tracing feature for gRPC server using OpenTelemetry.
+// The tracing feature is builtin enabled.
 func (s modServer) UnaryTracing(
 	ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler,
 ) (interface{}, error) {
diff --git a/contrib/rpc/grpcx/internal/tracing/tracing_interceptor_server.go b/contrib/rpc/grpcx/internal/tracing/tracing_interceptor_server.go
index 3ec503976..b94d4563e 100644
--- a/contrib/rpc/grpcx/internal/tracing/tracing_interceptor_server.go
+++ b/contrib/rpc/grpcx/internal/tracing/tracing_interceptor_server.go
@@ -27,7 +27,7 @@ import (
 )
 
 // UnaryServerInterceptor returns a grpc.UnaryServerInterceptor suitable
-// for use in a grpc.NewServer call.
+// for usage in a grpc.NewServer call.
 func UnaryServerInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
 	tracer := otel.GetTracerProvider().Tracer(
 		tracingInstrumentGrpcServer,