diff --git a/glep-0042.rst b/glep-0042.rst
index 416bd18..65c9230 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
 ---
 
@@ -208,7 +208,9 @@ compatibility with and for the same reasons as existing Gentoo documentation
 A news item file's content will consist of an RFC 822 style header [#rfc-822]_
 followed by the main body of the message as plain text. This GLEP defines
 various optional and mandatory headers. Future GLEPs may propose new headers —
-tools handling these news items must ignore any unrecognised header.
+tools handling these news items must ignore any unrecognised header. Headers
+where the name of the header is valid but the value is invalid shall also count
+as unrecognised.
 
 .. Note:: A previous version of this GLEP had required that news items must
    be signed with a detached OpenPGP signature. This was deemed no longer
@@ -247,17 +249,25 @@ 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. 2019-01-18) for
+    compatibility 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 managers should not
+    display expired items. In news item format ``2.1``, this field is
+    mandatory.
+
 The following headers are used for filtering:
 
 ``Display-If-Installed:``
     A package dependency specification (for example, ``>=sys-devel/gcc-5``
     or ``www-servers/apache``) conforming to EAPI 0 [#PMS]_ in news item
-    format ``1.0`` or to EAPI 5 in format ``2.0``.  If the user has the
+    format ``1.0`` or to EAPI 5 in format ``2.*``.  If the user has the
     package specified installed from the repository from which the news item
     was obtained, the news item should be displayed.
 
@@ -269,7 +279,7 @@ The following headers are used for filtering:
     A profile path, for example ``default/linux/sparc/13.0``. If the
     user is using the exact profile in question, the news item should be
     displayed. This header may be used to replace ``deprecated`` files in the
-    future.  In news item format ``2.0``, a terminal asterisk immediately
+    future.  In news item format ``2.*``, a terminal asterisk immediately
     following a slash acts as a wildcard for any further path components,
     for example ``default/linux/*``.