diff --git a/src/event/ngx_event.c b/src/event/ngx_event.c
index 1310f34..2dabf60 100644
--- a/src/event/ngx_event.c
+++ b/src/event/ngx_event.c
@@ -153,6 +153,8 @@
         if (ngx_event_flags & NGX_HAVE_IOCP_EVENT) {
             ev->event_handler = &ngx_event_acceptex;
 
+            /* LOOK: we call ngx_iocp_add_event() also
+               in ngx_event_post_acceptex() */
             if (ngx_iocp_add_event(ev) == NGX_ERROR) {
                 return NGX_ERROR;
             }