diff --git a/doc/go1.15.html b/doc/go1.15.html
index a863b96d2250d..492cac0b09f11 100644
--- a/doc/go1.15.html
+++ b/doc/go1.15.html
@@ -537,7 +537,9 @@ <h3 id="minor_library_changes">Minor changes to the library</h3>
 <dl id="regexp"><dt><a href="/pkg/regexp/">regexp</a></dt>
   <dd>
     <p><!-- CL 187919 -->
-      TODO: <a href="https://golang.org/cl/187919">https://golang.org/cl/187919</a>: add (*Regexp).SubexpIndex
+      The new <a href="/pkg/regexp/#Regexp.SubexpIndex"><code>Regexp.SubexpIndex</code></a>
+      method returns the index of the first subexpression with the given name
+      within the regular expression.
     </p>
   </dd>
 </dl><!-- regexp -->