diff --git a/doc/requests.org b/doc/requests.org
index b0c38fa..e0d3a6f 100644
--- a/doc/requests.org
+++ b/doc/requests.org
@@ -74,3 +74,5 @@ get customers/
   ...
 ]
 #+end_src
+*** products
+get products/
diff --git a/tienda_ilusion/don_confiao/serializers.py b/tienda_ilusion/don_confiao/serializers.py
index 923befe..92cb5ab 100644
--- a/tienda_ilusion/don_confiao/serializers.py
+++ b/tienda_ilusion/don_confiao/serializers.py
@@ -21,7 +21,7 @@ class SaleSerializer(serializers.ModelSerializer):
 class ProductSerializer(serializers.ModelSerializer):
     class Meta:
         model = Product
-        fields = ['id', 'name', 'price', 'measuring_unit', 'categories']
+        fields = ['id', 'name', 'price', 'measuring_unit', 'categories', 'external_id']
 
 
 class CustomerSerializer(serializers.ModelSerializer):