gcc-12/changes.html: OpenMP - mention masked support

diff --git a/htdocs/gcc-12/changes.html b/htdocs/gcc-12/changes.html
index a8859882..a58618cc 100644
--- a/htdocs/gcc-12/changes.html
+++ b/htdocs/gcc-12/changes.html
@@ -57,8 +57,10 @@ a work-in-progress.</p>
       clause, <code>defaultmap</code> has been updated for OpenMP 5.0, and the
       <code>loop</code> directive and combined directives
       involving <code>master</code> directive have been added. Additionally,
-      support for expressing OpenMP directives as C++ 11 attributes has been
-      added, which is an OpenMP 5.1 feature.
+      the following OpenMP 5.1 feature have been added: support for expressing
+      OpenMP directives as C++ 11 attributes, the <code>masked</code> construct,
+      and using <code>primary</code> with the <code>proc_bind</code> clause and
+      <code>OMP_PROC_BIND</code> environment variable.
   </li>
   <li>The new warning flag <code>-Wopenacc-parallelism</code> was added for
       OpenACC. It warns about potentially suboptimal choices related to