diff --git a/doc/NEWS b/doc/NEWS
index 186dcdcae6..d4b69cd624 100644
--- a/doc/NEWS
+++ b/doc/NEWS
@@ -1,3 +1,7 @@
+: tsort library
+
+  added.
+
 : stringio module
 
   Imported.  Pseudo (({IO})) class from/to (({String})).