diff --git a/modules/mol/alg/doc/molalg.rst b/modules/mol/alg/doc/molalg.rst
index 54dbc8914818ed3dad70b128db77019864ebc1e4..7a66937a12af17ad74b8859310849b2aee468aa4 100644
--- a/modules/mol/alg/doc/molalg.rst
+++ b/modules/mol/alg/doc/molalg.rst
@@ -606,7 +606,8 @@ Local Distance Test scores (lDDT, DRMSD)
 
   .. attribute:: global_score
   
-    Global lDDT score.
+    Global lDDT score. It is calculated as :attr:`conserved_contacts` divided
+    by :attr:`total_contacts`.
     
     :type: float
 
@@ -624,7 +625,8 @@ Local Distance Test scores (lDDT, DRMSD)
   
   .. attribute:: local_scores
   
-    Local scores.
+    Local scores. For each of the residue lDDT is it is calculated as residue
+    conserved contacts divided by residue total contacts.
   
     :type: list(:class:`~ost.mol.alg.lDDTLocalScore`)