diff --git a/README.md b/README.md
index c8efc32..7d6465c 100644
--- a/README.md
+++ b/README.md
@@ -108,6 +108,18 @@ 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 6958f64..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  ${OSM2PGSQL_EXTRA_ARGS} --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 857d847..b6918fb 100755
--- a/run.sh
+++ b/run.sh
@@ -52,7 +52,7 @@ 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