message: DOC: clarify requirements for non-watertight input
diff: @@ -185,6 +185,11 @@ void signed_distance_set_dimension( int dim );
  *
  * \note By default the input type is assumed to be a water-tight surface mesh.
  * \note Options must be set before initializing the Signed Distance Query.
  + *
  + * \note When the input is not a closed surface mesh, the assumption is that
  + * the surface mesh divides the computational mesh domain into two regions.
  + * Hence, the surface mesh has to span the entire domain of interest along
  + * some plane.
  */
  void signed_distance_set_closed_surface( bool status );
  