diff --git a/collections/E13g_tanker_boats_port.yaml b/collections/E13g_tanker_boats_port.yaml
index 51ba66b4..94649aa5 100644
--- a/collections/E13g_tanker_boats_port.yaml
+++ b/collections/E13g_tanker_boats_port.yaml
@@ -21,4 +21,4 @@ Resources:
     CollectionId: E13g
 References:
   - Name: AIS data
-    URL: https://www.imo.org/en/OurWork/Safety/Pages/AIS.aspx
+    Url: https://www.imo.org/en/OurWork/Safety/Pages/AIS.aspx