diff --git a/app.go b/app.go
index 07c67916..90575090 100644
--- a/app.go
+++ b/app.go
@@ -179,7 +179,7 @@ func run(args options) {
 			address := net.JoinHostPort(config.BindHost, strconv.Itoa(config.TLS.PortHTTPS))
 			// validate current TLS config and update warnings (it could have been loaded from file)
 			data := validateCertificates(config.TLS.CertificateChain, config.TLS.PrivateKey, config.TLS.ServerName)
-			if !data.usable {
+			if !data.ValidPair {
 				log.Fatal(data.WarningValidation)
 				os.Exit(1)
 			}
diff --git a/config.go b/config.go
index 87e5c6a8..1afc8f17 100644
--- a/config.go
+++ b/config.go
@@ -87,7 +87,7 @@ type tlsConfigStatus struct {
 	KeyType  string `yaml:"-" json:"key_type,omitempty"` // KeyType is one of RSA or ECDSA
 
 	// is usable? set by validator
-	usable bool
+	ValidPair bool `yaml:"-" json:"valid_pair"` // ValidPair is true if both certificate and private key are correct
 
 	// warnings
 	WarningValidation string `yaml:"-" json:"warning_validation,omitempty"` // WarningValidation is a validation warning message with the issue description
diff --git a/control.go b/control.go
index 57e614ca..eba3fd6e 100644
--- a/control.go
+++ b/control.go
@@ -1227,7 +1227,7 @@ func validateCertificates(certChain, pkey, serverName string) tlsConfigStatus {
 			data.WarningValidation = fmt.Sprintf("Invalid certificate or key: %s", err)
 			return data
 		}
-		data.usable = true
+		data.ValidPair = true
 	}
 
 	return data
diff --git a/control_test.go b/control_test.go
index c5df3b45..b823b252 100644
--- a/control_test.go
+++ b/control_test.go
@@ -71,7 +71,7 @@ kXS9jgARhhiWXJrk
 		data.NotBefore == notBefore &&
 		data.NotAfter == notAfter &&
 		// data.DNSNames[0] ==  &&
-		data.usable) {
+		data.ValidPair) {
 		t.Fatalf("valid cert & priv key: validateCertificates(): %v", data)
 	}
 }
diff --git a/openapi/openapi.yaml b/openapi/openapi.yaml
index f1e23f86..4cf406e0 100644
--- a/openapi/openapi.yaml
+++ b/openapi/openapi.yaml
@@ -1247,6 +1247,10 @@ definitions:
                 type: "string"
                 example: "You have specified an empty certificate"
                 description: "warning_validation is a validation warning message with the issue description"
+            valid_pair:
+                type: "boolean"
+                example: "true"
+                description: "valid_pair is true if both certificate and private key are correct"
     NetInterface:
         type: "object"
         description: "Network interface info"