diff --git a/doc/NEWS b/doc/NEWS
index 83f5ffcc65..186dcdcae6 100644
--- a/doc/NEWS
+++ b/doc/NEWS
@@ -1,3 +1,7 @@
+: stringio module
+
+  Imported.  Pseudo (({IO})) class from/to (({String})).
+
 : Array#pack, String#unpack
 
   allows comment in template strings.