diff --git a/node1.html b/node1.html
index 1e8f8cf..aeb6b3c 100644
--- a/node1.html
+++ b/node1.html
@@ -595,6 +595,7 @@ <h2>Implemented AST functions</h2>
 <li><span class=inv>result = starlink.Ast.outline( value, oper, array, lbnd, ubnd, maxerr, maxvert, inside, starpix  )
 </span></li>
 <li class="note">This is a static module function.</li>
+<li class="note">The "oper" parameter takes a constant from the list: Ast.LE, Ast.EQ, Ast.GT, Ast.LT, Ast.NE, Ast.GE, Ast.GT</li>
 </ul>
 </div>
 <div class="implemented" id="Overlap">