diff --git a/chapter-7/weblogs_TCP_server.snb.ipynb b/chapter-7/weblogs_TCP_server.snb.ipynb
index 630875b..5b36150 100644
--- a/chapter-7/weblogs_TCP_server.snb.ipynb
+++ b/chapter-7/weblogs_TCP_server.snb.ipynb
@@ -195,4 +195,5 @@
     "outputs" : [ ]
   } ],
   "nbformat" : 4
-}
\ No newline at end of file
+}
+// what is `ul()` in the files???