ustream: mark notify_read cb as optional

diff --git a/ustream.h b/ustream.h
index d9f98b78e86b1a7c22f6a8d918060422e59e1b3f..634a3e7e41b9e7931cc1f17841f1246fff4e6a8c 100644 (file)
--- a/ustream.h
+++ b/ustream.h
@@ -52,7 +52,7 @@ struct ustream {
        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