diff --git a/include/hpp/manipulation/graph/state.hh b/include/hpp/manipulation/graph/state.hh
index 359c031854feda1eed83e61eb21d8a8ece53b6ca..62a4fa7c068787ceff41d1e92f7e309024452f5a 100644
--- a/include/hpp/manipulation/graph/state.hh
+++ b/include/hpp/manipulation/graph/state.hh
@@ -100,7 +100,9 @@ namespace hpp {
             return neighbors_;
           }
 
-          /// Get the neighbors
+          /// Get the hidden neighbors
+          /// It is a vector of transitions outgoing from this state and that are
+          /// included in a waypoint edge.
           const Edges_t& hiddenNeighbors() const
           {
             return hiddenNeighbors_;