diff --git a/cmd/protoc-gen-dyn-gin/gin.go b/cmd/protoc-gen-dyn-gin/gin.go
index d0b3bb2..17d7f88 100644
--- a/cmd/protoc-gen-dyn-gin/gin.go
+++ b/cmd/protoc-gen-dyn-gin/gin.go
@@ -365,12 +365,19 @@ func lineComment(s string) string {
 		return ""
 	}
 	b := &strings.Builder{}
+	first := true
 	lines := strings.Split(strings.TrimSuffix(s, "\n"), "\n")
-	for i, line := range lines {
-		b.WriteString(strings.TrimSpace(strings.TrimPrefix(line, "//")))
-		if i+1 < len(lines) {
+	for _, line := range lines {
+		ss := strings.TrimSpace(strings.TrimPrefix(line, "//"))
+		if ss == "" {
+			continue
+		}
+		if !first {
 			b.WriteString(", ")
+		} else {
+			first = false
 		}
+		b.WriteString(ss)
 	}
 	return b.String()
 }
diff --git a/example/gen/hello/hello.gin.pb.go b/example/gen/hello/hello.gin.pb.go
index b10cd64..bab3c94 100644
--- a/example/gen/hello/hello.gin.pb.go
+++ b/example/gen/hello/hello.gin.pb.go
@@ -25,6 +25,8 @@ const __Greeter_Metadata_Service = "The greeting service definition."
 // GreeterHTTPServer The greeting service definition.
 type GreeterHTTPServer interface {
 	// SayHello Sends a hello
+	//
+	// 多一行
 	// I am a trailing comment
 	SayHello(context.Context, *HelloRequest) (*HelloReply, error)
 	// GetHello Get a hello
@@ -34,7 +36,7 @@ type GreeterHTTPServer interface {
 func RegisterGreeterHTTPServer(g *gin.RouterGroup, srv GreeterHTTPServer) {
 	r := g.Group("")
 	{
-		r.POST("/v1/hello", http.MetadataInterceptor(http.Metadata{Service: __Greeter_Metadata_Service, Method: "Sends a hello"}), _Greeter_SayHello0_HTTP_Handler(srv))
+		r.POST("/v1/hello", http.MetadataInterceptor(http.Metadata{Service: __Greeter_Metadata_Service, Method: "Sends a hello, 多一行"}), _Greeter_SayHello0_HTTP_Handler(srv))
 		r.GET("/v1/hello/:id", http.MetadataInterceptor(http.Metadata{Service: __Greeter_Metadata_Service, Method: "Get a hello"}), _Greeter_GetHello0_HTTP_Handler(srv))
 	}
 }
diff --git a/example/gen/hello/hello.resty.pb.go b/example/gen/hello/hello.resty.pb.go
index 69909fe..2b1bfab 100644
--- a/example/gen/hello/hello.resty.pb.go
+++ b/example/gen/hello/hello.resty.pb.go
@@ -20,6 +20,8 @@ var _ = http.NewClient
 // GreeterHTTPClient
 type GreeterHTTPClient interface {
 	// SayHello Sends a hello
+	//
+	// 多一行
 	// I am a trailing comment
 	SayHello(context.Context, *HelloRequest, ...http.CallOption) (*HelloReply, error)
 	// GetHello Get a hello
@@ -37,6 +39,8 @@ func NewGreeterHTTPClient(c *http.Client) GreeterHTTPClient {
 }
 
 // SayHello Sends a hello
+//
+// 多一行
 // I am a trailing comment
 func (c *GreeterHTTPClientImpl) SayHello(ctx context.Context, req *HelloRequest, opts ...http.CallOption) (*HelloReply, error) {
 	var err error
diff --git a/example/gen/hello/hello_grpc.pb.go b/example/gen/hello/hello_grpc.pb.go
index 62ccfc0..cf963f4 100644
--- a/example/gen/hello/hello_grpc.pb.go
+++ b/example/gen/hello/hello_grpc.pb.go
@@ -28,6 +28,8 @@ const (
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
 type GreeterClient interface {
 	// Sends a hello
+	//
+	// 多一行
 	SayHello(ctx context.Context, in *HelloRequest, opts ...grpc.CallOption) (*HelloReply, error)
 	// Get a hello
 	GetHello(ctx context.Context, in *GetHelloRequest, opts ...grpc.CallOption) (*GetHelloReply, error)
@@ -64,6 +66,8 @@ func (c *greeterClient) GetHello(ctx context.Context, in *GetHelloRequest, opts
 // for forward compatibility
 type GreeterServer interface {
 	// Sends a hello
+	//
+	// 多一行
 	SayHello(context.Context, *HelloRequest) (*HelloReply, error)
 	// Get a hello
 	GetHello(context.Context, *GetHelloRequest) (*GetHelloReply, error)
diff --git a/example/proto/hello/hello.proto b/example/proto/hello/hello.proto
index 8f54f83..173e6a8 100644
--- a/example/proto/hello/hello.proto
+++ b/example/proto/hello/hello.proto
@@ -12,6 +12,8 @@ import "google/api/annotations.proto";
 // The greeting service definition.
 service Greeter {
   // Sends a hello
+  //
+  // 多一行
   rpc SayHello(HelloRequest) returns (HelloReply) {  // I am a trailing comment
     option (google.api.http) = {
       post: "/v1/hello",