ustream: mark notify_read cb as optional

diff --git a/ustream.h b/ustream.h
index d9f98b7..634a3e7 100644 (file)
--- a/ustream.h
+++ b/ustream.h
@@ -52,7 +52,7 @@ struct ustream {
        struct ustream *next;
 
        /*
        struct ustream *next;
 
        /*

-        * notify_read:
+        * notify_read: (optional)

         * called by the ustream core to notify that new data is available
         * for reading.
         * must not free the ustream from this callback
         * called by the ustream core to notify that new data is available
         * for reading.
         * must not free the ustream from this callback