diff --git a/configurations/default/env.yml.tmp b/configurations/default/env.yml.tmp
index bd48088ad..efcad4a54 100644
--- a/configurations/default/env.yml.tmp
+++ b/configurations/default/env.yml.tmp
@@ -6,6 +6,7 @@ MAP_BASE_URL: optional-map-tile-url
 MAPBOX_ACCESS_TOKEN: your-mapbox-access-token
 MAPBOX_MAP_ID: mapbox/outdoors-v11
 MAPBOX_ATTRIBUTION: <a href="https://www.mapbox.com/about/maps/" target="_blank">&copy; Mapbox &copy; OpenStreetMap</a> <a href="https://www.mapbox.com/map-feedback/" target="_blank">Improve this map</a>
+# MAP_BASE_URL: http://tile.openstreetmap.org/{z}/{x}/{y}.png # Uncomment it if maps are gray
 SLACK_CHANNEL: optional-slack-channel
 SLACK_WEBHOOK: optional-slack-webhook
 GRAPH_HOPPER_KEY: your-graph-hopper-key
@@ -23,4 +24,4 @@ GRAPH_HOPPER_KEY: your-graph-hopper-key
 #      - 83
 GOOGLE_ANALYTICS_TRACKING_ID: optional-ga-key
 # GRAPH_HOPPER_POINT_LIMIT: 10 # Defaults to 30
-DISABLE_AUTH: true
\ No newline at end of file
+DISABLE_AUTH: true
diff --git a/docs/dev/deployment.md b/docs/dev/deployment.md
index 7a2376a16..7bbda2f57 100644
--- a/docs/dev/deployment.md
+++ b/docs/dev/deployment.md
@@ -244,6 +244,8 @@ Enables the GTFS Editor module.
 - `MAPBOX_ACCESS_TOKEN`
 - `R5_URL` (optional parameter for r5 routing in editor pattern drawing)
 
+**Note:** If maps are gray, add the property `MAP_BASE_URL: http://tile.openstreetmap.org/{z}/{x}/{y}.png` into `env.yml`.
+
 ### R5 network validation
 
 While the application handles basic validation even without the `r5_network`
@@ -320,4 +322,4 @@ extensions:
     enabled: true
     api: http://api.transitfeeds.com/v1/getFeeds
     key: your-api-key
-```
\ No newline at end of file
+```