diff --git a/SPEC.md b/SPEC.md
index eee34ee4..3c0c3e21 100644
--- a/SPEC.md
+++ b/SPEC.md
@@ -562,6 +562,7 @@ For certain operations, plugins must output result information. The output shoul
 ### ADD Success
 
 Plugins must output a JSON object with the following keys upon a successful `ADD` operation:
+All keys are optional other than `cniVersion`.
 
 - `cniVersion`: The same version supplied on input - the string "1.1.0"
 - `interfaces`: An array of all interfaces created by the attachment, including any host-level interfaces:
diff --git a/libcni/api_test.go b/libcni/api_test.go
index 26852f39..fb760671 100644
--- a/libcni/api_test.go
+++ b/libcni/api_test.go
@@ -311,8 +311,7 @@ var _ = Describe("Invoking plugins", func() {
 			debug = &noop_debug.Debug{
 				ReportResult: `{
 					"cniVersion": "` + version.Current() + `",
-					"ips": [{"address": "10.1.2.3/24"}],
-					"dns": {}
+					"ips": [{"address": "10.1.2.3/24"}]
 				}`,
 			}
 			Expect(debug.WriteDebug(debugFilePath)).To(Succeed())
@@ -1001,7 +1000,7 @@ var _ = Describe("Invoking plugins", func() {
 						},
 					},
 					// DNS injected by last plugin
-					DNS: types.DNS{
+					DNS: &types.DNS{
 						Nameservers: []string{"1.2.3.4"},
 					},
 				}))
diff --git a/libcni/conf_test.go b/libcni/conf_test.go
index ea7104f2..1de76389 100644
--- a/libcni/conf_test.go
+++ b/libcni/conf_test.go
@@ -497,7 +497,7 @@ var _ = Describe("Loading configuration from disk", func() {
 				Expect(err).NotTo(HaveOccurred())
 
 				Expect(resultConfig).To(Equal(&libcni.NetworkConfig{
-					Network: &types.NetConf{Name: "some-plugin", Type: "bridge", DNS: types.DNS{Nameservers: servers, Domain: "local"}},
+					Network: &types.NetConf{Name: "some-plugin", Type: "bridge", DNS: &types.DNS{Nameservers: servers, Domain: "local"}},
 					Bytes:   expectedPluginConfig,
 				}))
 			})
diff --git a/pkg/types/100/types.go b/pkg/types/100/types.go
index d6d069f5..3ea6cbc7 100644
--- a/pkg/types/100/types.go
+++ b/pkg/types/100/types.go
@@ -92,7 +92,7 @@ type Result struct {
 	Interfaces []*Interface   `json:"interfaces,omitempty"`
 	IPs        []*IPConfig    `json:"ips,omitempty"`
 	Routes     []*types.Route `json:"routes,omitempty"`
-	DNS        types.DNS      `json:"dns,omitempty"`
+	DNS        *types.DNS     `json:"dns,omitempty"`
 }
 
 // Note: DNS should be omit if DNS is empty but default Marshal function
@@ -168,7 +168,7 @@ func convertFrom04x(from types.Result, toVersion string) (types.Result, error) {
 	fromResult := from.(*types040.Result)
 	toResult := &Result{
 		CNIVersion: toVersion,
-		DNS:        *fromResult.DNS.Copy(),
+		DNS:        fromResult.DNS.Copy(),
 		Routes:     []*types.Route{},
 	}
 	for _, fromIntf := range fromResult.Interfaces {
diff --git a/pkg/types/100/types_test.go b/pkg/types/100/types_test.go
index 3bd50bd7..4078ac67 100644
--- a/pkg/types/100/types_test.go
+++ b/pkg/types/100/types_test.go
@@ -72,7 +72,7 @@ func testResult() *current.Result {
 			{Dst: *routev4, GW: routegwv4},
 			{Dst: *routev6, GW: routegwv6},
 		},
-		DNS: types.DNS{
+		DNS: &types.DNS{
 			Nameservers: []string{"1.2.3.4", "1::cafe"},
 			Domain:      "acompany.com",
 			Search:      []string{"somedomain.com", "otherdomain.net"},
diff --git a/pkg/types/types.go b/pkg/types/types.go
index 58b57947..440991b4 100644
--- a/pkg/types/types.go
+++ b/pkg/types/types.go
@@ -64,7 +64,7 @@ type NetConf struct {
 	Type         string          `json:"type,omitempty"`
 	Capabilities map[string]bool `json:"capabilities,omitempty"`
 	IPAM         IPAM            `json:"ipam,omitempty"`
-	DNS          DNS             `json:"dns,omitempty"`
+	DNS          *DNS            `json:"dns,omitempty"`
 
 	RawPrevResult map[string]interface{} `json:"prevResult,omitempty"`
 	PrevResult    Result                 `json:"-"`
diff --git a/pkg/types/types_test.go b/pkg/types/types_test.go
index ee0a829c..5f554167 100644
--- a/pkg/types/types_test.go
+++ b/pkg/types/types_test.go
@@ -179,7 +179,7 @@ var _ = Describe("Types", func() {
 						Gateway:   net.ParseIP("abcd:1234:ffff::1"),
 					},
 				},
-				DNS: types.DNS{
+				DNS: &types.DNS{
 					Nameservers: []string{"1.2.3.4", "1::cafe"},
 					Domain:      "acompany.com",
 					Search:      []string{"somedomain.com", "otherdomain.net"},