diff --git a/protoc-gen-grpc-gateway/descriptor/registry.go b/protoc-gen-grpc-gateway/descriptor/registry.go
index 16df86b4436..74e67b8981a 100644
--- a/protoc-gen-grpc-gateway/descriptor/registry.go
+++ b/protoc-gen-grpc-gateway/descriptor/registry.go
@@ -36,6 +36,9 @@ type Registry struct {
 
 	// allowDeleteBody permits http delete methods to have a body
 	allowDeleteBody bool
+
+	// allowMerge generation one swagger file out of multiple protos
+	allowMerge bool
 }
 
 // NewRegistry returns a new Registry.
@@ -282,6 +285,16 @@ func (r *Registry) SetAllowDeleteBody(allow bool) {
 	r.allowDeleteBody = allow
 }
 
+// SetAllowMerge controls whether generation one swagger file out of multiple protos
+func (r *Registry) SetAllowMerge(allow bool) {
+	r.allowMerge = allow
+}
+
+// IsAllowMerge whether generation one swagger file out of multiple protos
+func (r *Registry) IsAllowMerge() bool {
+	return r.allowMerge
+}
+
 // sanitizePackageName replaces unallowed character in package name
 // with allowed character.
 func sanitizePackageName(pkgName string) string {
diff --git a/protoc-gen-swagger/genswagger/generator.go b/protoc-gen-swagger/genswagger/generator.go
index 697e540b4ae..08237921d4e 100644
--- a/protoc-gen-swagger/genswagger/generator.go
+++ b/protoc-gen-swagger/genswagger/generator.go
@@ -13,6 +13,7 @@ import (
 	plugin "github.com/golang/protobuf/protoc-gen-go/plugin"
 	"github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway/descriptor"
 	gen "github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway/generator"
+	swagger_options "github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger/options"
 )
 
 var (
@@ -30,6 +31,30 @@ func New(reg *descriptor.Registry) gen.Generator {
 
 func (g *generator) Generate(targets []*descriptor.File) ([]*plugin.CodeGeneratorResponse_File, error) {
 	var files []*plugin.CodeGeneratorResponse_File
+	if g.reg.IsAllowMerge() {
+		var mergedTarget *descriptor.File
+		// try to find proto leader
+		for _, f := range targets {
+			if proto.HasExtension(f.Options, swagger_options.E_Openapiv2Swagger) {
+				mergedTarget = f
+				break
+			}
+		}
+		// merge protos to leader
+		for _, f := range targets {
+			if mergedTarget == nil {
+				mergedTarget = f
+			} else {
+				mergedTarget.Enums = append(mergedTarget.Enums, f.Enums...)
+				mergedTarget.Messages = append(mergedTarget.Messages, f.Messages...)
+				mergedTarget.Services = append(mergedTarget.Services, f.Services...)
+			}
+		}
+
+		targets = nil
+		targets = append(targets, mergedTarget)
+	}
+
 	for _, file := range targets {
 		glog.V(1).Infof("Processing %s", file.GetName())
 		code, err := applyTemplate(param{File: file, reg: g.reg})
diff --git a/protoc-gen-swagger/main.go b/protoc-gen-swagger/main.go
index ebbaecbd36f..a1387b1b9c8 100644
--- a/protoc-gen-swagger/main.go
+++ b/protoc-gen-swagger/main.go
@@ -19,6 +19,7 @@ var (
 	importPrefix    = flag.String("import_prefix", "", "prefix to be added to go package paths for imported proto files")
 	file            = flag.String("file", "-", "where to load data from")
 	allowDeleteBody = flag.Bool("allow_delete_body", false, "unless set, HTTP DELETE methods may not have a body")
+	allowMerge      = flag.Bool("allow_merge", false, "if set, generation one swagger file out of multiple protos")
 )
 
 func parseReq(r io.Reader) (*plugin.CodeGeneratorRequest, error) {
@@ -66,6 +67,7 @@ func main() {
 
 	reg.SetPrefix(*importPrefix)
 	reg.SetAllowDeleteBody(*allowDeleteBody)
+	reg.SetAllowMerge(*allowMerge)
 	for k, v := range pkgMap {
 		reg.AddPkgMap(k, v)
 	}