diff --git a/contract/models/abstract_contract_line.py b/contract/models/abstract_contract_line.py
index a1ed154dc..a7c603367 100644
--- a/contract/models/abstract_contract_line.py
+++ b/contract/models/abstract_contract_line.py
@@ -59,6 +59,8 @@ class ContractAbstractContractLine(models.AbstractModel):
             ('weekly', 'Week(s)'),
             ('monthly', 'Month(s)'),
             ('monthlylastday', 'Month(s) last day'),
+            ('quarterly', 'Quarter(s)'),
+            ('semesterly', 'Semester(s)'),
             ('yearly', 'Year(s)'),
         ],
         default='monthly',
diff --git a/contract/models/contract_line.py b/contract/models/contract_line.py
index e5074d654..d67447965 100644
--- a/contract/models/contract_line.py
+++ b/contract/models/contract_line.py
@@ -799,6 +799,10 @@ class ContractLine(models.Model):
             return relativedelta(months=interval)
         elif recurring_rule_type == 'monthlylastday':
             return relativedelta(months=interval, day=1)
+        elif recurring_rule_type == 'quarterly':
+            return relativedelta(months=3 * interval)
+        elif recurring_rule_type == 'semesterly':
+            return relativedelta(months=6 * interval)
         else:
             return relativedelta(years=interval)
 
diff --git a/product_contract/models/product_template.py b/product_contract/models/product_template.py
index 3ce6bdc44..0e784d993 100644
--- a/product_contract/models/product_template.py
+++ b/product_contract/models/product_template.py
@@ -22,6 +22,8 @@ class ProductTemplate(models.Model):
             ('weekly', 'Week(s)'),
             ('monthly', 'Month(s)'),
             ('monthlylastday', 'Month(s) last day'),
+            ('quarterly', 'Quarter(s)'),
+            ('semesterly', 'Semester(s)'),
             ('yearly', 'Year(s)'),
         ],
         default='monthly',
diff --git a/product_contract/models/sale_order_line.py b/product_contract/models/sale_order_line.py
index bcaf1cef8..4883306db 100644
--- a/product_contract/models/sale_order_line.py
+++ b/product_contract/models/sale_order_line.py
@@ -27,6 +27,8 @@ class SaleOrderLine(models.Model):
             ('weekly', 'Week(s)'),
             ('monthly', 'Month(s)'),
             ('monthlylastday', 'Month(s) last day'),
+            ('quarterly', 'Quarter(s)'),
+            ('semesterly', 'Semester(s)'),
             ('yearly', 'Year(s)'),
         ],
         default='monthly',