diff --git a/rma_account/models/account_move.py b/rma_account/models/account_move.py
index 602b0542..bc92b5d9 100644
--- a/rma_account/models/account_move.py
+++ b/rma_account/models/account_move.py
@@ -170,5 +170,6 @@ class AccountMoveLine(models.Model):
         comodel_name="rma.order.line",
         string="RMA line refund",
         ondelete="set null",
-        help="This will contain the rma line that originated the refund line",
+        index=True,
+        help="This will contain the rma line that originated this line",
     )