SPF 2.0: Update dates and explain status

1 files changed, 18 insertions, 3 deletions

diff --git a/specs/spf-2.0/index.mdwn b/specs/spf-2.0/index.mdwn
index 1efee59..2a45902 100644
--- a/specs/spf-2.0/index.mdwn
+++ b/specs/spf-2.0/index.mdwn
@@ -1,6 +1,6 @@
     Status: DRAFT
-    Date: 2020-06-17
-    Revises: Source Package Format 1.0
+    Date: 2023-09-25
+    Obsoletes: Source Package Format 1.0
 
 
 Abstract
@@ -15,11 +15,26 @@ Status
 This specification is in `DRAFT` status.  It is a work-in-progress and is
 subject to change.  Comments and revisions are welcome.
 
+Although some sections have yet to be written, this specification is already
+implemented by package building tools and over 100 source packages since 2012.
+Any changes made to written sections will maintain compatibility with the
+existing format and implementations.
+
+Occasionally, new optional elements of the format are added and existing
+limitations are relaxed.  Such changes are made in tandem with corresponding
+support being added to package building tools.  Source packages that make use of
+such new elements and relaxed limitations are responsible for ensuring that
+package building tools are new enough to support them, by listing such tools and
+minimum required versions in the `Build-Depends` control field (see
+$[sectlink][fields-src]).  Refer to the release notes of package building tools
+to identify the versions in which support is added for changes to this Source
+Package Format.
+
 
 Legal Notice
 ============
 
-Copyright © 2012, 2019, 2020 Patrick "P. J." McDermott
+Copyright © 2012, 2019-2021, 2023 Patrick "P. J." McDermott
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the