diff --git a/app/vmalert/utils/auth.go b/app/vmalert/utils/auth.go
index 77ad69ddbc..35db61fb31 100644
--- a/app/vmalert/utils/auth.go
+++ b/app/vmalert/utils/auth.go
@@ -59,6 +59,7 @@ func WithOAuth(clientID, clientSecret, clientSecretFile, tokenURL, scopes string
 	}
 }
 
+// WithHeaders returns AuthConfigOptions and set Headers based on the given params
 func WithHeaders(headers string) AuthConfigOptions {
 	return func(config *promauth.HTTPClientConfig) {
 		if headers != "" {