diff --git a/grpcutil/dns_resolver.go b/grpcutil/dns_resolver.go
index d87c61a89..18f844deb 100644
--- a/grpcutil/dns_resolver.go
+++ b/grpcutil/dns_resolver.go
@@ -103,8 +103,8 @@ func parseTarget(target string) (host, port string, err error) {
 
 // Resolve creates a watcher that watches the SRV/hostname record resolution of the target.
 //
-// First SRV record resolution is attempted for the specified service; if this fails, hostname record resolution is
-// attempted instead.
+// If service is not empty, watcher will first attempt to resolve SRV record.
+// If that fails or service was empty, hostname record resolution is attempted instead.
 func (r *dnsResolver) Resolve(target, service string) (Watcher, error) {
 	host, port, err := parseTarget(target)
 	if err != nil {