Add NEWS entry.
diff --git a/Misc/NEWS b/Misc/NEWS
index f0bac32..479090f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -7,6 +7,11 @@
 
 *Release date: XX-XXX-2012*
 
+Core and Builtins
+-----------------
+
+- Issue #14673: Add Eric Snow's sys.implementation implementation.
+
 Library
 -------