diff --git a/app/src/frontend/building/data-containers/planning.tsx b/app/src/frontend/building/data-containers/planning.tsx
index 183b7bdd..ed478fa8 100644
--- a/app/src/frontend/building/data-containers/planning.tsx
+++ b/app/src/frontend/building/data-containers/planning.tsx
@@ -147,6 +147,7 @@ const PlanningView: React.FunctionComponent<CategoryViewProps> = (props) => (
                 mode={props.mode}
                 copy={props.copy}
                 onChange={props.onChange}
+                tooltip={dataFields.planning_nhle_link.tooltip}
                 placeholder="https://..."
                 editableEntries={true}
                 isUrl={true}
diff --git a/app/src/frontend/config/data-fields-config.ts b/app/src/frontend/config/data-fields-config.ts
index f807e07b..2384fb2b 100644
--- a/app/src/frontend/config/data-fields-config.ts
+++ b/app/src/frontend/config/data-fields-config.ts
@@ -467,8 +467,8 @@ export const dataFields = { /* eslint-disable @typescript-eslint/camelcase */
     planning_nhle_link: {
         category: Category.Planning,
         title: "NHLE list entry link",
-        example: "",
-        //tooltip: ,
+        tooltip: "URL for National Heritage List for England entry",
+        example: ["", "", ""],
     },
     planning_list_id: {
         category: Category.Planning,