Add news entry for r74841.
diff --git a/Misc/NEWS b/Misc/NEWS
index 72aa48e..f4b076e 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,8 @@
 Core and Builtins
 -----------------
 
+- Issue #1590864: Fix potential deadlock when mixing threads and fork().
+
 - Issue #6844: Do not emit DeprecationWarnings when accessing a "message"
   attribute on exceptions that was set explicitly.