diff --git a/definition/definition.go b/definition/definition.go
index f807e283..d2a5b44d 100644
--- a/definition/definition.go
+++ b/definition/definition.go
@@ -206,6 +206,8 @@ type Result struct {
 
 // Definition defines an API handler.
 type Definition struct {
+	// OperationID is Unique string used to identify the operation. The OperationID MUST be unique among all operations described in the API.
+	OperationID string
 	// Method is definition method.
 	Method Method
 	// Consumes indicates how many content types the handler can consume.
diff --git a/service/rest/builder.go b/service/rest/builder.go
index eca99a18..204c9273 100644
--- a/service/rest/builder.go
+++ b/service/rest/builder.go
@@ -131,6 +131,7 @@ func (b *builder) addDescriptor(prefix string, consumes []string, produces []str
 func (b *builder) copyDefinition(d *definition.Definition, consumes []string, produces []string, tags []string) *definition.Definition {
 	newOne := &definition.Definition{
 		Method:      d.Method,
+		OperationID: d.OperationID,
 		Summary:     d.Summary,
 		Function:    d.Function,
 		Description: d.Description,
diff --git a/utils/api/definitions.go b/utils/api/definitions.go
index 49c01ba1..de127513 100644
--- a/utils/api/definitions.go
+++ b/utils/api/definitions.go
@@ -60,6 +60,8 @@ type Definition struct {
 	HTTPMethod string
 	// HTTPCode is http success code.
 	HTTPCode int
+	// OperationID is Unique string used to identify the operation. The OperationID MUST be unique among all operations described in the API.
+	OperationID string
 	// Summary is a brief of this definition.
 	Summary string
 	// Description describes the API handler.
@@ -99,6 +101,7 @@ func NewDefinition(tc *TypeContainer, d *definition.Definition, apiStyle service
 		Method:        d.Method,
 		HTTPMethod:    service.HTTPMethodFor(d.Method),
 		HTTPCode:      code,
+		OperationID:   d.OperationID,
 		Summary:       d.Summary,
 		Description:   d.Description,
 		Tags:          d.Tags,
diff --git a/utils/generators/swagger/generator.go b/utils/generators/swagger/generator.go
index bc5c76b6..5a69eca1 100644
--- a/utils/generators/swagger/generator.go
+++ b/utils/generators/swagger/generator.go
@@ -433,6 +433,7 @@ func (g *Generator) operationFor(def *api.Definition) *spec.Operation {
 			operation.Produces = append(operation.Produces, p)
 		}
 	}
+	operation.ID = def.OperationID
 	operation.Summary = def.Summary
 	if operation.Summary == "" {
 		// Use function name as API summary.