diff --git a/pkg/apis/operations/v1alpha2/register.go b/pkg/apis/operations/v1alpha2/register.go
index 3151a466e..171f3db55 100644
--- a/pkg/apis/operations/v1alpha2/register.go
+++ b/pkg/apis/operations/v1alpha2/register.go
@@ -49,11 +49,11 @@ func addWebService(c *restful.Container) error {
 
 	webservice.Route(webservice.POST("/namespaces/{namespace}/jobs/{job}").
 		To(operations.RerunJob).
-		Doc("Job rerun").
+		Doc("Rerun job whether the job is complete or not").
 		Deprecate().
 		Param(webservice.PathParameter("job", "job name")).
-		Param(webservice.PathParameter("namespace", "job's namespace")).
-		Param(webservice.QueryParameter("a", "action")).
+		Param(webservice.PathParameter("namespace", "the namespace where the job runs in")).
+		Param(webservice.QueryParameter("action", "action must be \"rerun\"")).
 		Returns(http.StatusOK, ok, errors.Error{}))
 
 	c.Add(webservice)
diff --git a/pkg/apis/resources/v1alpha2/register.go b/pkg/apis/resources/v1alpha2/register.go
index bbb4fa760..f7454dab6 100644
--- a/pkg/apis/resources/v1alpha2/register.go
+++ b/pkg/apis/resources/v1alpha2/register.go
@@ -83,7 +83,7 @@ func addWebService(c *restful.Container) error {
 		Doc("Rerun job whether the job is complete or not").
 		Param(webservice.PathParameter("job", "job name")).
 		Param(webservice.PathParameter("namespace", "the namespace where the job runs in")).
-		Param(webservice.QueryParameter("a", "action")).
+		Param(webservice.QueryParameter("action", "action must be \"rerun\"")).
 		Returns(http.StatusOK, ok, errors.Error{}))
 
 	webservice.Route(webservice.GET("/{resources}").
diff --git a/pkg/apiserver/operations/job.go b/pkg/apiserver/operations/job.go
index e87411030..cd0436e47 100644
--- a/pkg/apiserver/operations/job.go
+++ b/pkg/apiserver/operations/job.go
@@ -33,7 +33,7 @@ func RerunJob(req *restful.Request, resp *restful.Response) {
 
 	job := req.PathParameter("job")
 	namespace := req.PathParameter("namespace")
-	action := req.QueryParameter("a")
+	action := req.QueryParameter("action")
 
 	switch action {
 	case "rerun":