add news note (#16597)
diff --git a/Misc/NEWS b/Misc/NEWS
index 8f5460a..268e438 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -160,6 +160,9 @@
 Library
 -------
 
+- Issue #16597: In buffered and text IO, call close() on the underlying stream
+  if invoking flush() fails.
+
 - Issue #16646: ftplib.FTP.makeport() might lose socket error details.
   (patch by Serhiy Storchaka)