diff --git a/.env.example b/.env.example
index 512f904..841b410 100644
--- a/.env.example
+++ b/.env.example
@@ -7,6 +7,7 @@ DB_NAME=mapguesser
 GOOGLE_MAPS_SERVER_API_KEY=your_google_maps_server_api_key
 GOOGLE_MAPS_JS_API_KEY=your_google_maps_js_api_key
 LEAFLET_TILESERVER_URL=a_leaflet_compatible_tileserver_url
+LEAFLET_TILESERVER_SUBDOMAINS=list_of_subdomains_for_the_tileserver_without_separators
 LEAFLET_TILESERVER_ATTRIBUTION=attribution_to_be_shown_for_tiles
 STATIC_ROOT=/static
 MAIL_FROM=mapguesser@mapguesser-dev.ch
diff --git a/README.md b/README.md
index c1e6050..de024a9 100644
--- a/README.md
+++ b/README.md
@@ -65,7 +65,12 @@ Required API keys:
 * **GOOGLE_MAPS_SERVER_API_KEY**: this it used by the backend and should have access to **Street View Static API**
 * **GOOGLE_MAPS_JS_API_KEY**: this is used by the frontend and should have access to **Maps JavaScript API** and **Maps Static API**
 
-Additionally, a tile provider is also needed for map editor. This should be configured by `LEAFLET_TILESERVER_URL` and `LEAFLET_TILESERVER_ATTRIBUTION`. You can find some providers here: https://wiki.openstreetmap.org/wiki/Tile_servers. OpenStreetMap's tile server is fine for testing.
+Additionally, a tile provider is also needed for map editor. This should be configured by `LEAFLET_TILESERVER_URL`, `LEAFLET_TILESERVER_SUBDOMAINS` and `LEAFLET_TILESERVER_ATTRIBUTION`. You can find some providers here: https://wiki.openstreetmap.org/wiki/Tile_servers. OpenStreetMap's tile server is fine for testing.
+Example:
+```
+LEAFLET_TILESERVER_URL=https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png
+LEAFLET_TILESERVER_SUBDOMAINS=abc
+```
 
 ### (Production only) Create cron job
 
diff --git a/public/static/js/map_editor.js b/public/static/js/map_editor.js
index 9e3a70c..32e7f48 100644
--- a/public/static/js/map_editor.js
+++ b/public/static/js/map_editor.js
@@ -382,7 +382,7 @@
 
                 L.tileLayer(tileUrl, {
                     attribution: tileAttribution,
-                    subdomains: '1234',
+                    subdomains: tileSubdomains,
                     ppi: highResData.ppi,
                     tileSize: highResData.tileSize,
                     zoomOffset: highResData.zoomOffset,
diff --git a/views/admin/map_editor.php b/views/admin/map_editor.php
index 4b6da75..cd69871 100644
--- a/views/admin/map_editor.php
+++ b/views/admin/map_editor.php
@@ -94,6 +94,7 @@
 @section(pageScript)
 <script>
     var tileUrl = '<?= $_ENV['LEAFLET_TILESERVER_URL'] ?>';
+    var tileSubdomains = '<?= $_ENV['LEAFLET_TILESERVER_SUBDOMAINS'] ?>';
     var tileAttribution = '<?= $_ENV['LEAFLET_TILESERVER_ATTRIBUTION'] ?>';
     var mapId = <?= $mapId ?>;
     var mapBounds = <?= json_encode($bounds) ?>;