diff --git a/letsencrypt/cli.py b/letsencrypt/cli.py
index 9aa79cfa9..455b2d074 100644
--- a/letsencrypt/cli.py
+++ b/letsencrypt/cli.py
@@ -807,6 +807,7 @@ def _restore_required_config_elements(config, renewalparams):
     for config_item in INT_CONFIG_ITEMS:
         if config_item in renewalparams and not _set_by_cli(config_item):
             config_value = renewalparams[config_item]
+            # the default value for http01_port was None during private beta
             if config_item == "http01_port" and config_value == "None":
                 logger.info("updating legacy http01_port value")
                 int_value = flag_default("http01_port")