diff --git a/access.go b/access.go
index 933bf3b..11c1ad2 100644
--- a/access.go
+++ b/access.go
@@ -59,11 +59,10 @@ func (c *Client) Password(userid, password string) error {
 }
 
 // NewDomain create a new domain with the required two parameters pull it and use domain.Update to configure
-// t is an enum: ad, ldap, openid, pam, pve
-func (c *Client) NewDomain(realm, t string) error {
+func (c *Client) NewDomain(realm string, domainType DomainType) error {
 	return c.Post("/access/domains", map[string]string{
 		"realm": realm,
-		"type":  t,
+		"type":  string(domainType),
 	}, nil)
 }
 
diff --git a/types.go b/types.go
index 28ecb39..14c31d2 100644
--- a/types.go
+++ b/types.go
@@ -275,11 +275,11 @@ type Time struct {
 type Timeframe string
 
 const (
-	HOUR  = Timeframe("hour")
-	DAY   = Timeframe("day")
-	WEEK  = Timeframe("week")
-	MONTH = Timeframe("month")
-	YEAR  = Timeframe("year")
+	TimeframeHour  = Timeframe("hour")
+	TimeframeDay   = Timeframe("day")
+	TimeframeWeek  = Timeframe("week")
+	TimeframeMonth = Timeframe("month")
+	TimeframeYear  = Timeframe("year")
 )
 
 type ConsolidationFunction string
@@ -975,6 +975,16 @@ type PoolUpdateOption struct {
 	VirtualMachines string `json:"vms,omitempty"`
 }
 
+type DomainType string
+
+const (
+	DomainTypeAD     = DomainType("ad")
+	DomainTypeLDAP   = DomainType("ldap")
+	DomainTypeOpenID = DomainType("openid")
+	DomainTypePam    = DomainType("pam")
+	DomainTypePVE    = DomainType("pve")
+)
+
 type Domains []*Domain
 type Domain struct {
 	client *Client
diff --git a/virtual_machine_test.go b/virtual_machine_test.go
index 456fff2..fd5f4eb 100644
--- a/virtual_machine_test.go
+++ b/virtual_machine_test.go
@@ -32,7 +32,7 @@ func TestVirtualMachine_RRDData(t *testing.T) {
 		Node:   "node1",
 	}
 
-	rdddata, err := vm.RRDData(HOUR)
+	rdddata, err := vm.RRDData(TimeframeHour)
 	assert.Nil(t, err)
 	assert.Len(t, rdddata, 70)
 }