diff --git a/bikeshed/boilerplate/whatwg/computed-metadata-LS-COMMIT.include b/bikeshed/boilerplate/whatwg/computed-metadata-LS-COMMIT.include
index 79d4c4d460..8928f1f1ac 100644
--- a/bikeshed/boilerplate/whatwg/computed-metadata-LS-COMMIT.include
+++ b/bikeshed/boilerplate/whatwg/computed-metadata-LS-COMMIT.include
@@ -10,5 +10,6 @@
     "<a href=/ id=commit-snapshot-link>Go to the living standard</a>",
     "<a href=https://twitter.com/[TWITTER]>@[TWITTER]</a>"
   ],
-  "!Tests": "<a href=https://github.com/web-platform-tests/wpt/tree/master/[SHORTNAME]>web-platform-tests [SHORTNAME]/</a> (<a href=https://github.com/web-platform-tests/wpt/labels/[SHORTNAME]>ongoing work</a>)"
+  "!Tests": "<a href=https://github.com/web-platform-tests/wpt/tree/master/[SHORTNAME]>web-platform-tests [SHORTNAME]/</a> (<a href=https://github.com/web-platform-tests/wpt/labels/[SHORTNAME]>ongoing work</a>)",
+  "Warning": "obsolete"
 }
diff --git a/bikeshed/boilerplate/whatwg/warning-obsolete.include b/bikeshed/boilerplate/whatwg/warning-obsolete.include
new file mode 100644
index 0000000000..dbe6e57ed3
--- /dev/null
+++ b/bikeshed/boilerplate/whatwg/warning-obsolete.include
@@ -0,0 +1,10 @@
+<details open class="annoying-warning">
+  <summary>This is a commit snapshot of the standard</summary>
+  <p>
+    This document contains the contents of the standard as of the <a href="https://github.com/whatwg/$SHORTNAME/commit/[COMMIT-SHA]">[COMMIT-SHA] commit</a>,
+    and should only be used as a historical reference.
+  <p>
+    Do not attempt to implement this version of the standard.
+    Do not reference this version as authoritative in any way.
+    Instead, see <a href="/">https://[SHORTNAME].spec.whatwg.org/</a> for the living standard.
+</details>