diff --git a/Misc/NEWS b/Misc/NEWS
index 1339e61..4c08298 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -215,6 +215,10 @@
 Library
 -------
 
+- Issue #1670765: Prevent email.generator.Generator from re-wrapping
+  headers in multipart/signed MIME parts, which fixes one of the sources of
+  invalid modifications to such parts by Generator.
+
 - Issue #7703: Add support for the new buffer API to `binascii.a2bhqx`.
   Patch by Florent Xicluna, along with some additional tests.