diff --git a/doc/using_adjacency_list.html b/doc/using_adjacency_list.html
index 45772144..d96a7f60 100644
--- a/doc/using_adjacency_list.html
+++ b/doc/using_adjacency_list.html
@@ -133,7 +133,7 @@ out-edges for the whole graph.
 <PRE>
 vertex()
 </PRE>
-This operation is constant time for <TT>vecS</TT> and  for
+This operation is constant time for <TT>vecS</TT> and <i>O(V)</i> for
 <TT>listS</TT>.
 
 </ul>