diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 0000000..92b3fea
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,17 @@
+module.exports = {
+    "env": {
+        "browser": true,
+        "es6": true
+    },
+    "extends": "eslint:recommended",
+    "globals": {
+        "Atomics": "readonly",
+        "SharedArrayBuffer": "readonly"
+    },
+    "parserOptions": {
+        "ecmaVersion": 14,
+        "sourceType": "module"
+    },
+    "rules": {
+    }
+};
diff --git a/agenda/trip.py b/agenda/trip.py
index e8f542f..3bdf492 100644
--- a/agenda/trip.py
+++ b/agenda/trip.py
@@ -58,7 +58,9 @@ def load_trains(
     return trains
 
 
-def load_ferries(data_dir: str) -> list[StrDict]:
+def load_ferries(
+    data_dir: str, route_distances: travel.RouteDistances | None = None
+) -> list[StrDict]:
     """Load ferries."""
     ferries = load_travel("ferry", "ferries", data_dir)
     terminals = travel.parse_yaml("ferry_terminals", data_dir)
@@ -70,6 +72,9 @@ def load_ferries(data_dir: str) -> list[StrDict]:
         item["from_terminal"] = from_terminal
         item["to_terminal"] = to_terminal
 
+        if route_distances:
+            travel.add_leg_route_distance(item, route_distances)
+
         geojson = from_terminal["routes"].get(item["to"])
         if geojson:
             item["geojson_filename"] = geojson
@@ -131,7 +136,7 @@ def build_trip_list(
     travel_items = sorted(
         load_flights(data_dir)
         + load_trains(data_dir, route_distances=route_distances)
-        + load_ferries(data_dir),
+        + load_ferries(data_dir, route_distances=route_distances),
         key=depart_datetime,
     )
 
diff --git a/package.json b/package.json
index 082b994..47a8c57 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
   "license": "ISC",
   "devDependencies": {
     "copy-webpack-plugin": "^12.0.2",
+    "eslint": "^9.2.0",
     "webpack": "^5.91.0",
     "webpack-cli": "^5.1.4"
   },