--- a/src/line_proto.h	Tue Apr 28 23:10:30 2009 +0300
+++ b/src/line_proto.h	Tue Apr 28 23:10:38 2009 +0300
@@ -64,6 +64,8 @@
 /**
  * Flush out any buffered line fragment. Returns zero if the buffer was flushed empty, >0 if there's still fragments
  * remaining, or -err on errors.
+ *
+ * It is a bug to call this if there is no data waiting to be sent.
  */
 int line_proto_flush (struct line_proto *lp);