diff --git a/mrp_average_cost/__manifest__.py b/mrp_average_cost/__manifest__.py
index 04112d5..60d2730 100644
--- a/mrp_average_cost/__manifest__.py
+++ b/mrp_average_cost/__manifest__.py
@@ -22,7 +22,7 @@ This module has been written by Alexis de Lattre from Akretion <alexis.delattre@
     """,
     'author': 'Akretion',
     'website': 'https://github.com/akretion/odoo-usability',
-    'depends': ['mrp'],
+    'depends': ['mrp_account'],
     'data': [
         'security/mrp_average_cost_security.xml',
         'security/ir.model.access.csv',
diff --git a/mrp_average_cost/models/mrp.py b/mrp_average_cost/models/mrp.py
index 07c4db8..e4a97fe 100644
--- a/mrp_average_cost/models/mrp.py
+++ b/mrp_average_cost/models/mrp.py
@@ -165,7 +165,9 @@ class MrpProduction(models.Model):
 
     company_currency_id = fields.Many2one(
         related='company_id.currency_id', string='Company Currency')
-    # extra_cost is per unit in the UoM of the mrp.production (product_uom_id)
+    # extra_cost is a native field of mrp_account
+    # we convert it to a computed field
+    # extra_cost is per unit in the UoM of mrp.production (product_uom_id)
     extra_cost = fields.Float(
         compute='_compute_extra_cost', store=True, readonly=False,
         help="For a regular production order, it takes into account the labor cost "