diff --git a/README.md b/README.md
index 4a7797e..5c844e7 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,9 @@ func main() {
 	// If it doesn't exist, the adapter will create it automatically.
 	// a := mongodbadapter.NewAdapter("127.0.0.1:27017/abc")
 	
+	// Or you can appoint the table name "rule" like this.
+	// a := mongodbadapter.NewAdapter("127.0.0.1:27017/abc", "rule")
+	
 	e := casbin.NewEnforcer("examples/rbac_model.conf", a)
 	
 	// Load the policy from DB.
diff --git a/adapter.go b/adapter.go
index 4f0f0e3..d5487ba 100644
--- a/adapter.go
+++ b/adapter.go
@@ -49,11 +49,18 @@ func finalizer(a *adapter) {
 
 // NewAdapter is the constructor for Adapter. If database name is not provided
 // in the Mongo URL, 'casbin' will be used as database name.
-func NewAdapter(url string) persist.Adapter {
+// Can use provided table name.
+func NewAdapter(url string, tableName ...string) persist.Adapter {
 	a := &adapter{url: url}
 
 	// Open the DB, create it if not existed.
-	a.open()
+	if len(tableName) == 0 {
+		a.open()
+	} else if len(tableName) == 1 {
+		a.open(tableName[0])
+	} else {
+		panic(errors.New("invalid parameter: tableName"))
+	}
 
 	// Call the destructor when the object is released.
 	runtime.SetFinalizer(a, finalizer)
@@ -68,7 +75,8 @@ func NewFilteredAdapter(url string) persist.FilteredAdapter {
 	return NewAdapter(url).(*adapter)
 }
 
-func (a *adapter) open() {
+func (a *adapter) open(tableName ...string) {
+	var collection *mgo.Collection
 	dI, err := mgo.ParseURL(a.url)
 	if err != nil {
 		panic(err)
@@ -91,11 +99,14 @@ func (a *adapter) open() {
 	}
 
 	db := session.DB(dI.Database)
-	collection := db.C("casbin_rule")
+	if len(tableName) == 0 {
+		collection = db.C("casbin_rule")
+	} else {
+		collection = db.C(tableName[0])
+	}
 
 	a.session = session
 	a.collection = collection
-
 	indexes := []string{"ptype", "v0", "v1", "v2", "v3", "v4", "v5"}
 	for _, k := range indexes {
 		if err := a.collection.EnsureIndexKey(k); err != nil {