diff --git a/omaha/omaha.go b/omaha/omaha.go
index 86710d6..24cb4e6 100644
--- a/omaha/omaha.go
+++ b/omaha/omaha.go
@@ -193,12 +193,18 @@ type Actions struct {
 }
 
 type Action struct {
-	XMLName         xml.Name `xml:"action" datastore:"-"`
-	Event           string   `xml:"event,attr"`
-	ChromeOSVersion string   `xml:"ChromeOSVersion,attr"`
-	Sha256          string   `xml:"sha256,attr"`
-	NeedsAdmin      bool     `xml:"needsadmin,attr"`
-	IsDelta         bool     `xml:"IsDelta,attr"`
+	XMLName xml.Name `xml:"action" datastore:"-"`
+	Event   string   `xml:"event,attr"`
+
+	// Extensions added by update_engine
+	ChromeOSVersion       string `xml:"ChromeOSVersion,attr"`
+	Sha256                string `xml:"sha256,attr"`
+	NeedsAdmin            bool   `xml:"needsadmin,attr"`
+	IsDelta               bool   `xml:"IsDelta,attr"`
+	DisablePayloadBackoff bool   `xml:"DisablePayloadBackoff,attr,omitempty"`
+	MetadataSignatureRsa  string `xml:"MetadataSignatureRsa,attr,omitempty"`
+	MetadataSize          string `xml:"MetadataSize,attr,omitempty"`
+	Deadline              string `xml:"deadline,attr,omitempty"`
 }
 
 func (m *Manifest) AddAction(event string) *Action {
diff --git a/omaha/omaha_test.go b/omaha/omaha_test.go
index ca43c41..594d69c 100644
--- a/omaha/omaha_test.go
+++ b/omaha/omaha_test.go
@@ -61,6 +61,7 @@ func ExampleOmaha_NewResponse() {
 	a.Sha256 = "0VAlQW3RE99SGtSB5R4m08antAHO8XDoBMKDyxQT/Mg="
 	a.NeedsAdmin = false
 	a.IsDelta = true
+	a.DisablePayloadBackoff = true
 
 	if raw, err := xml.MarshalIndent(response, "", " "); err != nil {
 		fmt.Println(err)
@@ -84,7 +85,7 @@ func ExampleOmaha_NewResponse() {
 	//      <package hash="+LXvjiaPkeYDLHoNKlf9qbJwvnk=" name="update.gz" size="67546213" required="true"></package>
 	//     </packages>
 	//     <actions>
-	//      <action event="postinstall" ChromeOSVersion="9999.0.0" sha256="0VAlQW3RE99SGtSB5R4m08antAHO8XDoBMKDyxQT/Mg=" needsadmin="false" IsDelta="true"></action>
+	//      <action event="postinstall" ChromeOSVersion="9999.0.0" sha256="0VAlQW3RE99SGtSB5R4m08antAHO8XDoBMKDyxQT/Mg=" needsadmin="false" IsDelta="true" DisablePayloadBackoff="true"></action>
 	//     </actions>
 	//    </manifest>
 	//   </updatecheck>