docu update

loop/doc/structure_db.rst

@@ -154,12 +154,16 @@ database, you might want to consider two things:
                         (we advise you to provide a surface estimated with the
                         full :class:`ost.mol.EntityView` the *chain* belongs to)
     :param prof:        Profile information for this *chain*.
+    :param solvent_accessibility_string: Name of float property where the 
+                                         solvent accessibilities are stored
+                                         on a per residue basis in *chain*
 
     :type pdb_id:       :class:`str`
     :type chain_name:   :class:`str`
     :type chain:        :class:`ost.mol.ChainView`
     :type surf:         :class:`ost.mol.SurfaceHandle`
     :type prof:         :class:`ost.seq.ProfileHandle`
+    :type solvent_accessibility_string: :class:`str`
 
     :returns: DB index of added chain.
     :rtype:   :class:`int`