diff --git a/fedcm/easyjson.go b/fedcm/easyjson.go
index ea05dcc..674ed74 100644
--- a/fedcm/easyjson.go
+++ b/fedcm/easyjson.go
@@ -170,6 +170,8 @@ func easyjsonC5a4559bDecodeGithubComChromedpCdprotoFedcm2(in *jlexer.Lexer, out
 		switch key {
 		case "dialogId":
 			out.DialogID = string(in.String())
+		case "dialogType":
+			(out.DialogType).UnmarshalEasyJSON(in)
 		case "accounts":
 			if in.IsNull() {
 				in.Skip()
@@ -224,6 +226,11 @@ func easyjsonC5a4559bEncodeGithubComChromedpCdprotoFedcm2(out *jwriter.Writer, i
 		out.RawString(prefix[1:])
 		out.String(string(in.DialogID))
 	}
+	{
+		const prefix string = ",\"dialogType\":"
+		out.RawString(prefix)
+		(in.DialogType).MarshalEasyJSON(out)
+	}
 	{
 		const prefix string = ",\"accounts\":"
 		out.RawString(prefix)
diff --git a/fedcm/events.go b/fedcm/events.go
index e573d39..61f94aa 100644
--- a/fedcm/events.go
+++ b/fedcm/events.go
@@ -6,8 +6,9 @@ package fedcm
 //
 // See: https://chromedevtools.github.io/devtools-protocol/tot/FedCm#event-dialogShown
 type EventDialogShown struct {
-	DialogID string     `json:"dialogId"`
-	Accounts []*Account `json:"accounts"`
-	Title    string     `json:"title"` // These exist primarily so that the caller can verify the RP context was used appropriately.
-	Subtitle string     `json:"subtitle,omitempty"`
+	DialogID   string     `json:"dialogId"`
+	DialogType DialogType `json:"dialogType"`
+	Accounts   []*Account `json:"accounts"`
+	Title      string     `json:"title"` // These exist primarily so that the caller can verify the RP context was used appropriately.
+	Subtitle   string     `json:"subtitle,omitempty"`
 }
diff --git a/fedcm/types.go b/fedcm/types.go
index f982d85..53857e4 100644
--- a/fedcm/types.go
+++ b/fedcm/types.go
@@ -56,6 +56,52 @@ func (t *LoginState) UnmarshalJSON(buf []byte) error {
 	return easyjson.Unmarshal(buf, t)
 }
 
+// DialogType whether the dialog shown is an account chooser or an auto
+// re-authentication dialog.
+//
+// See: https://chromedevtools.github.io/devtools-protocol/tot/FedCm#type-DialogType
+type DialogType string
+
+// String returns the DialogType as string value.
+func (t DialogType) String() string {
+	return string(t)
+}
+
+// DialogType values.
+const (
+	DialogTypeAccountChooser DialogType = "AccountChooser"
+	DialogTypeAutoReauthn    DialogType = "AutoReauthn"
+)
+
+// MarshalEasyJSON satisfies easyjson.Marshaler.
+func (t DialogType) MarshalEasyJSON(out *jwriter.Writer) {
+	out.String(string(t))
+}
+
+// MarshalJSON satisfies json.Marshaler.
+func (t DialogType) MarshalJSON() ([]byte, error) {
+	return easyjson.Marshal(t)
+}
+
+// UnmarshalEasyJSON satisfies easyjson.Unmarshaler.
+func (t *DialogType) UnmarshalEasyJSON(in *jlexer.Lexer) {
+	v := in.String()
+	switch DialogType(v) {
+	case DialogTypeAccountChooser:
+		*t = DialogTypeAccountChooser
+	case DialogTypeAutoReauthn:
+		*t = DialogTypeAutoReauthn
+
+	default:
+		in.AddError(fmt.Errorf("unknown DialogType value: %v", v))
+	}
+}
+
+// UnmarshalJSON satisfies json.Unmarshaler.
+func (t *DialogType) UnmarshalJSON(buf []byte) error {
+	return easyjson.Unmarshal(buf, t)
+}
+
 // Account corresponds to IdentityRequestAccount.
 //
 // See: https://chromedevtools.github.io/devtools-protocol/tot/FedCm#type-Account