diff --git a/glep-0042.rst b/glep-0042.rst
index 416bd18..dc2d77f 100644
--- a/glep-0042.rst
+++ b/glep-0042.rst
@@ -9,10 +9,10 @@ Type: Standards Track
 Status: Final
 Version: 4
 Created: 2005-10-31
-Last-Modified: 2017-11-29
+Last-Modified: 2018-01-04
 Post-History: 2005-11-01, 2005-11-05, 2005-11-07, 2005-12-11, 2005-12-13,
               2005-12-18, 2006-01-05, 2006-03-02, 2006-03-06, 2006-06-12,
-              2006-09-05, 2016-03-10, 2017-11-27
+              2006-09-05, 2016-03-10, 2017-11-27, 2018-01-04
 Content-Type: text/x-rst
 ---
 
@@ -247,11 +247,20 @@ The following headers describe the purpose and format of the news item:
     item. Mandatory.
 
 ``News-Item-Format:``
-    Known formats are ``1.0`` and ``2.0``.  Future revisions to the format
-    may increment the minor number for forwards-compatible changes (i.e.,
-    still allowing older tools to process the new format), or the major
+    Known formats are ``1.0``, ``2.0``, and ``2.1``.  Future revisions to the
+    format may increment the minor number for forwards-compatible changes
+    (i.e., still allowing older tools to process the new format), or the major
     number for major changes.
 
+  ``Expires:``
+    Date of expiration, in ``yyyy-mm-dd`` format (e.g. 2005-12-18) for
+    compatability with GLEP 45 [#glep-45]_. Translations should use the date of
+    the original news item. An item is expired if the current date in UTC is
+    greater than the expiration date of the item. Package manages should not
+    display expired items. In news item format ``>2.0``, this field is
+    mandatory. This field did not exist in formats ``<=2.0`` and is optional
+    there.
+
 The following headers are used for filtering:
 
 ``Display-If-Installed:``