diff --git a/internal/engine/experiment/dnscheck/dnscheck.go b/internal/engine/experiment/dnscheck/dnscheck.go
index 575a87c..66b805d 100644
--- a/internal/engine/experiment/dnscheck/dnscheck.go
+++ b/internal/engine/experiment/dnscheck/dnscheck.go
@@ -23,7 +23,7 @@ import (
 
 const (
 	testName      = "dnscheck"
-	testVersion   = "0.9.1"
+	testVersion   = "0.9.2"
 	defaultDomain = "example.org"
 )
 
@@ -88,6 +88,7 @@ type TestKeys struct {
 	HTTPHost         string                        `json:"x_http_host,omitempty"`
 	TLSServerName    string                        `json:"x_tls_server_name,omitempty"`
 	TLSVersion       string                        `json:"x_tls_version,omitempty"`
+	Residual         bool                          `json:"x_residual"`
 	Bootstrap        *urlgetter.TestKeys           `json:"bootstrap"`
 	BootstrapFailure *string                       `json:"bootstrap_failure"`
 	Lookups          map[string]urlgetter.TestKeys `json:"lookups"`
@@ -141,6 +142,7 @@ func (m *Measurer) Run(
 	tk.HTTPHost = m.Config.HTTPHost
 	tk.TLSServerName = m.Config.TLSServerName
 	tk.TLSVersion = m.Config.TLSVersion
+	tk.Residual = m.Endpoints != nil
 
 	// 3. parse the input URL describing the resolver to use
 	input := string(measurement.Input)
@@ -309,7 +311,10 @@ func makeResolverURL(URL *url.URL, addr string) string {
 
 // NewExperimentMeasurer creates a new ExperimentMeasurer.
 func NewExperimentMeasurer(config Config) model.ExperimentMeasurer {
-	return &Measurer{Config: config}
+	return &Measurer{
+		Config:    config,
+		Endpoints: nil, // disabled by default
+	}
 }
 
 // SummaryKeys contains summary keys for this experiment.
diff --git a/internal/engine/experiment/dnscheck/dnscheck_test.go b/internal/engine/experiment/dnscheck/dnscheck_test.go
index d60db75..2bc1966 100644
--- a/internal/engine/experiment/dnscheck/dnscheck_test.go
+++ b/internal/engine/experiment/dnscheck/dnscheck_test.go
@@ -49,7 +49,7 @@ func TestExperimentNameAndVersion(t *testing.T) {
 	if measurer.ExperimentName() != "dnscheck" {
 		t.Error("unexpected experiment name")
 	}
-	if measurer.ExperimentVersion() != "0.9.1" {
+	if measurer.ExperimentVersion() != "0.9.2" {
 		t.Error("unexpected experiment version")
 	}
 }