diff --git a/doc/go1.15.html b/doc/go1.15.html
index 8872d7113884ca..e7b74560599758 100644
--- a/doc/go1.15.html
+++ b/doc/go1.15.html
@@ -433,6 +433,19 @@ <h3 id="minor_library_changes">Minor changes to the library</h3>
   </dd>
 </dl><!-- bufio -->
 
+<dl id="context"><dt><a href="/pkg/context/">context</a></dt>
+  <dd>
+    <p><!-- CL 223777 -->
+      Creating a derived <code>Context</code> using a nil parent is now explicitly
+      disallowed. Any attempt to do so with the
+      <a href="/pkg/context/#WithValue"><code>WithValue</code></a>,
+      <a href="/pkg/context/#WithDeadline"><code>WithDeadline</code></a>, or
+      <a href="/pkg/context/#WithCancel"><code>WithCancel</code></a> functions
+      will cause a panic.
+    </p>
+  </dd>
+</dl><!-- context -->
+
 <dl id="crypto"><dt><a href="/pkg/crypto/">crypto</a></dt>
   <dd>
     <p><!-- CL 231417, CL 225460 -->