diff --git a/automations_fire_test.go b/automations_fire_test.go
index 0d674c9..5ceb279 100644
--- a/automations_fire_test.go
+++ b/automations_fire_test.go
@@ -92,3 +92,30 @@ func TestAutomationRuleUpdateRequestCanSendFalseValues(t *testing.T) {
 		t.Fatalf("zero rotate flag should stay omitted: %s", got)
 	}
 }
+
+func TestAutomationRuleUpdateRequestPreservesOncallIncidentTriggerFields(t *testing.T) {
+	var req AutomationRuleUpdateRequest
+	if err := json.Unmarshal([]byte(`{
+		"rule_id":"auto_1",
+		"oncall_incident_trigger_enabled":false,
+		"oncall_incident_channel_ids":[],
+		"oncall_incident_severities":[]
+	}`), &req); err != nil {
+		t.Fatal(err)
+	}
+	payload, err := json.Marshal(&req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	got := string(payload)
+	for _, want := range []string{
+		`"rule_id":"auto_1"`,
+		`"oncall_incident_trigger_enabled":false`,
+		`"oncall_incident_channel_ids":[]`,
+		`"oncall_incident_severities":[]`,
+	} {
+		if !strings.Contains(got, want) {
+			t.Fatalf("payload %s missing %s", got, want)
+		}
+	}
+}
diff --git a/automations_models.go b/automations_models.go
index ff8b883..fc7f260 100644
--- a/automations_models.go
+++ b/automations_models.go
@@ -26,4 +26,10 @@ type AutomationRuleUpdateRequest struct {
 	HTTPPostTriggerEnabled *bool `json:"http_post_trigger_enabled,omitempty" toon:"http_post_trigger_enabled,omitempty"`
 	// Whether to rotate the HTTP POST trigger token. The new token is returned only in this response.
 	RotateHTTPPostTriggerToken bool `json:"rotate_http_post_trigger_token,omitempty" toon:"rotate_http_post_trigger_token,omitempty"`
+	// Whether the on-call incident trigger is enabled. Sending true creates it when missing and channel/severity filters are provided.
+	OncallIncidentTriggerEnabled *bool `json:"oncall_incident_trigger_enabled,omitempty" toon:"oncall_incident_trigger_enabled,omitempty"`
+	// On-call channel IDs whose new incidents can trigger this rule.
+	OncallIncidentChannelIDs *[]int64 `json:"oncall_incident_channel_ids,omitempty" toon:"oncall_incident_channel_ids,omitempty"`
+	// Incident severities that can trigger this rule.
+	OncallIncidentSeverities *[]string `json:"oncall_incident_severities,omitempty" toon:"oncall_incident_severities,omitempty"`
 }