diff --git a/InvenTree/InvenTree/serializers.py b/InvenTree/InvenTree/serializers.py
index 7149668cc4..4ad5d1b87a 100644
--- a/InvenTree/InvenTree/serializers.py
+++ b/InvenTree/InvenTree/serializers.py
@@ -37,6 +37,11 @@ class InvenTreeModelSerializer(serializers.ModelSerializer):
     """
 
     def validate(self, data):
+        """ Perform serializer validation.
+        In addition to running validators on the serializer fields,
+        this class ensures that the underlying model is also validated.
+        """
+        
         # Run any native validation checks first (may throw an ValidationError)
         data = super(serializers.ModelSerializer, self).validate(data)
 
diff --git a/InvenTree/part/models.py b/InvenTree/part/models.py
index 4022b7ec71..887c983511 100644
--- a/InvenTree/part/models.py
+++ b/InvenTree/part/models.py
@@ -533,7 +533,7 @@ class SupplierPart(models.Model):
         return cost + self.base_cost
 
     def __str__(self):
-        return "{sku} - {supplier}".format(
+        return "{supplier} ({sku})".format(
             sku=self.SKU,
             supplier=self.supplier.name)
 
diff --git a/InvenTree/stock/models.py b/InvenTree/stock/models.py
index 636efeb293..2f61c068cd 100644
--- a/InvenTree/stock/models.py
+++ b/InvenTree/stock/models.py
@@ -77,6 +77,14 @@ class StockItem(models.Model):
             )
 
     def clean(self):
+        """ Validate the StockItem object (separate to field validation)
+
+        The following validation checks are performed:
+
+        - The 'part' and 'supplier_part.part' fields cannot point to the same Part object
+        - The 'part' does not belong to itself
+        - Quantity must be 1 if the StockItem has a serial number
+        """
 
         # The 'supplier_part' field must point to the same part!
         try: