diff --git a/account_constraints/account_constraints.py b/account_constraints/account_constraints.py
index 42637d1cc..114ea389e 100644
--- a/account_constraints/account_constraints.py
+++ b/account_constraints/account_constraints.py
@@ -45,7 +45,10 @@ class AccountMoveLine(orm.Model):
     _inherit = 'account.move.line'
 
     def _authorized_reconcile(self, vals):
-        "check if only reconcile value are altered"
+        """ Check if only reconcile_id and/or reconcile_partial_id are altered. We
+        cannot change other vals, but we should be able to write or unlink those field
+        (e.g. when you want to manually unreconcile an entry generated by an invoice).
+        """
         if not vals:
             return False
         rec_keys = set(["reconcile_id", "reconcile_partial_id"])
@@ -85,7 +88,7 @@ class AccountMoveLine(orm.Model):
 
         - Is the move related to an invoice
         - Is the move related to a bank statement
-        - Only pure reconcile are allowed
+        - Is other values than reconcile_partial_id and/or reconcile_id modified
 
         In that case, we forbid the move to be deleted even if draft. We
         should never delete directly a move line related or generated by
@@ -104,7 +107,7 @@ class AccountMoveLine(orm.Model):
 
         - Is the move related to an invoice
         - Is the move related to a bank statement
-        - Only pure reconcile are allowed
+        - Is other values than reconcile_partial_id and/or reconcile_id modified
 
         In that case, we forbid the move to be modified even if draft.
         We should never update directly a move line related or generated