diff --git a/src/http/modules/ngx_http_sub_filter_module.c b/src/http/modules/ngx_http_sub_filter_module.c
index e0b2c5b67..37b04256b 100644
--- a/src/http/modules/ngx_http_sub_filter_module.c
+++ b/src/http/modules/ngx_http_sub_filter_module.c
@@ -677,9 +677,6 @@ ngx_http_sub_create_conf(ngx_conf_t *cf)
      * set by ngx_pcalloc():
      *
      *     conf->match = { 0, NULL };
-     *     conf->sub = { 0, NULL };
-     *     conf->sub_lengths = NULL;
-     *     conf->sub_values = NULL;
      *     conf->types = { NULL };
      *     conf->types_keys = NULL;
      */