diff --git a/Dockerfile b/Dockerfile
index 3c964e8..a84c7f2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -87,6 +87,8 @@ RUN cmake .. \
   && make -j $(nproc)
 USER root
 RUN make install
+RUN mkdir /nodes \
+    && chown renderer:renderer /nodes
 USER renderer
 
 # Install and test Mapnik
diff --git a/README.md b/README.md
index d5bcc13..f76ef3e 100644
--- a/README.md
+++ b/README.md
@@ -139,6 +139,18 @@ docker run \
     run
 ```
 
+### CACHE
+
+The import and tile serving processes use 800 MB RAM cache by default, but this number can be changed by option -C. For example:
+```
+docker run \
+    -p 80:80 \
+    -e "OSM2PGSQL_EXTRA_ARGS=-C 4096" \
+    -v openstreetmap-data:/var/lib/postgresql/10/main \
+    -d overv/openstreetmap-tile-server \
+    run
+```
+
 ### AUTOVACUUM
 
 The database use the autovacuum feature by default. This behavior can be changed with `AUTOVACUUM` environment variable. For example:
diff --git a/openstreetmap-tiles-update-expire b/openstreetmap-tiles-update-expire
index dea6e9e..9e495f6 100644
--- a/openstreetmap-tiles-update-expire
+++ b/openstreetmap-tiles-update-expire
@@ -22,7 +22,7 @@ OSM2PGSQL_BIN=osm2pgsql
 TRIM_BIN=/home/$ACCOUNT/src/regional/trim_osc.py
 
 DBNAME=gis
-OSM2PGSQL_OPTIONS="-d $DBNAME -G --hstore --tag-transform-script /home/renderer/src/openstreetmap-carto/openstreetmap-carto.lua -C 2048 --number-processes ${THREADS:-4} -S /home/renderer/src/openstreetmap-carto/openstreetmap-carto.style"
+OSM2PGSQL_OPTIONS="-d $DBNAME -G --hstore  ${OSM2PGSQL_EXTRA_ARGS} --tag-transform-script /home/renderer/src/openstreetmap-carto/openstreetmap-carto.lua --number-processes ${THREADS:-4} -S /home/renderer/src/openstreetmap-carto/openstreetmap-carto.style"
 
 #------------------------------------------------------------------------------
 # When using trim_osc.py we can define either a bounding box (such as this
diff --git a/run.sh b/run.sh
index 035835b..3f6c9a3 100755
--- a/run.sh
+++ b/run.sh
@@ -56,7 +56,7 @@ if [ "$1" = "import" ]; then
     fi
 
     # Import data
-    sudo -u renderer osm2pgsql -d gis --create --slim -G --hstore --tag-transform-script /home/renderer/src/openstreetmap-carto/openstreetmap-carto.lua -C 2048 --number-processes ${THREADS:-4} ${OSM2PGSQL_EXTRA_ARGS} -S /home/renderer/src/openstreetmap-carto/openstreetmap-carto.style /data.osm.pbf
+    sudo -u renderer osm2pgsql -d gis --create --slim -G --hstore --tag-transform-script /home/renderer/src/openstreetmap-carto/openstreetmap-carto.lua --number-processes ${THREADS:-4} ${OSM2PGSQL_EXTRA_ARGS} -S /home/renderer/src/openstreetmap-carto/openstreetmap-carto.style /data.osm.pbf
 
     # Create indexes
     sudo -u postgres psql -d gis -f indexes.sql