diff --git a/project-ideas/shipping-aggregator.md b/project-ideas/shipping-aggregator.md
index 346b15bd..b1b2d9ff 100644
--- a/project-ideas/shipping-aggregator.md
+++ b/project-ideas/shipping-aggregator.md
@@ -413,3 +413,11 @@ The `CarrierShipmentMethod` entity represents the specific shipping methods avai
 *   To modify a shipment method's type, delete the existing record and create a new one with the desired `shipmentMethodEnumId`.
 *   Ensure the `shipmentMethodEnumId` in the request body is a valid enumeration value using validation logic.
 
+
+Useful links
+
+https://github.com/hotwax/mantle-fedex
+https://github.com/hotwax/mantle-shipstation
+https://github.com/hotwax/mantle-shipengine
+
+