diff --git a/README.md b/README.md
index 6cec73c..69ce0f7 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,19 @@ docker run \
 
 Refer to the section *Automatic updating and tile expiry* to actually enable the updates while running the tile server.
 
+### Letting the container download the file
+
+It is also possible to let the container download files for you rather than mounting them in advance by using the `DOWNLOAD_PBF` and `DOWNLOAD_POLY` parameters:
+
+```
+docker run \
+    -e DOWNLOAD_PBF=http://download.geofabrik.de/europe/luxembourg-latest.osm.pbf \
+    -e DOWNLOAD_POLY=http://download.geofabrik.de/europe/luxembourg.poly \
+    -v openstreetmap-data:/var/lib/postgresql/12/main \
+    overv/openstreetmap-tile-server \
+    import
+```
+
 ## Running the server
 
 Run the server like this:
diff --git a/run.sh b/run.sh
index 78505a6..dae1746 100755
--- a/run.sh
+++ b/run.sh
@@ -42,18 +42,18 @@ if [ "$1" = "import" ]; then
     setPostgresPassword
 
     # Download Luxembourg as sample if no data is provided
-    if [ ! -f /data.osm.pbf ] && [ -z "$DL_PBF" ]; then
+    if [ ! -f /data.osm.pbf ] && [ -z "$DOWNLOAD_PBF" ]; then
         echo "WARNING: No import file at /data.osm.pbf, so importing Luxembourg as example..."
-        DL_PBF="http://download.geofabrik.de/europe/luxembourg-latest.osm.pbf"
-        DL_PBF_POLY="http://download.geofabrik.de/europe/luxembourg.poly"
+        DOWNLOAD_PBF="http://download.geofabrik.de/europe/luxembourg-latest.osm.pbf"
+        DOWNLOAD_POLY="http://download.geofabrik.de/europe/luxembourg.poly"
     fi
-    
-    if [ -n "$DL_PBF" ]; then
-        echo "INFO: Download PBF file: $DL_PBF"
-        wget -nv "$DL_PBF" -O /data.osm.pbf
-        if [ -n "$DL_PBF_POLY" ]; then
-            echo "INFO: Download PBF-POLY file: $DL_PBF_POLY"
-            wget -nv "$DL_PBF_POLY" -O /data.poly
+
+    if [ -n "$DOWNLOAD_PBF" ]; then
+        echo "INFO: Download PBF file: $DOWNLOAD_PBF"
+        wget -nv "$DOWNLOAD_PBF" -O /data.osm.pbf
+        if [ -n "$DOWNLOAD_POLY" ]; then
+            echo "INFO: Download PBF-POLY file: $DOWNLOAD_POLY"
+            wget -nv "$DOWNLOAD_POLY" -O /data.poly
         fi
     fi