diff --git a/cmd/start.go b/cmd/start.go
index d565066..58159c0 100644
--- a/cmd/start.go
+++ b/cmd/start.go
@@ -87,6 +87,7 @@ var startCmd = &cobra.Command{
 
 func init() {
 	// Register flags with Cobra
+	// Do not set default values here. Use viper.SetDefault() instead. https://github.com/spf13/viper/issues/671
 	startCmd.Flags().StringP("port", "p", "", "Port to listen on")
 	startCmd.Flags().String("client-id", "", "OIDC Client ID")
 	startCmd.Flags().String("issuer-url", "", "Identity Provider Issuer URL")