diff --git a/README.md b/README.md
index 0cb4cfe..0066967 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ clone or [download GitHub repository](https://github.com/felixlohmeier/openrefin
 #### Options
 
 ```
-./openrefine-batch.sh $inputdir $configdir $outputdir $crossdir $ram $version $inputformat $inputoptions
+./openrefine-batch.sh $inputdir $configdir $outputdir $crossdir $ram $version $restart $inputformat $inputoptions
 ```
 
 1. inputdir: path to directory with source files (multiple files may be imported into a single project [by providing a zip or tar.gz archive](https://github.com/OpenRefine/OpenRefine/wiki/Importers))
@@ -57,8 +57,9 @@ clone or [download GitHub repository](https://github.com/felixlohmeier/openrefin
 4. crossdir: path to directory with additional OpenRefine projects (will be copied to workspace before transformation step to support the [cross function](https://github.com/OpenRefine/OpenRefine/wiki/GREL-Other-Functions#crosscell-c-string-projectname-string-columnname))
 5. ram: maximum RAM for OpenRefine java heap space (default: 4G)
 6. version: OpenRefine version (2.7rc1, 2.6rc2, 2.6rc1, dev)
-7. inputformat: csv, tsv, xml, json, line-based, fixed-width, xlsx or ods
-8. inputoptions: several options provided by [openrefine-client](https://hub.docker.com/r/felixlohmeier/openrefine-client/)
+7. restart: restart docker container after each transformation to clear memory (restart-true/restart-false)
+8. inputformat: (csv, tsv, xml, json, line-based, fixed-width, xlsx, ods)
+9. inputoptions: several options provided by [openrefine-client](https://hub.docker.com/r/felixlohmeier/openrefine-client/)
 
 inputoptions (mandatory for xml, json, fixed-width, xslx, ods):
 * `--recordPath=RECORDPATH` (xml, json): please provide path in multiple arguments without slashes, e.g. /collection/record/ should be entered like this: `--recordPath=collection --recordPath=record`
@@ -85,7 +86,7 @@ more inputoptions (optional, only together with inputformat):
 The script uses `docker attach` to print log messages from OpenRefine server and `ps` to show statistics for each step. Here is a sample log:
 
 ```
-[03:27 felix ~/openrefine-batch (master *)]$ ./openrefine-batch.sh examples/powerhouse-museum/input/ examples/powerhouse-museum/config/ examples/powerhouse-museum/output/ examples/powerhouse-museum/cross/ 4G 2.7rc1 tsv --processQuotes=false --guessCellValueTypes=true
+[03:27 felix ~/openrefine-batch (master *)]$ ./openrefine-batch.sh examples/powerhouse-museum/input/ examples/powerhouse-museum/config/ examples/powerhouse-museum/output/ examples/powerhouse-museum/cross/ 4G 2.7rc1 restart-true tsv --processQuotes=false --guessCellValueTypes=true
 Input directory:        /home/felix/openrefine-batch/examples/powerhouse-museum/input
 Input files:            phm-collection.tsv
 Input format:           --format=tsv
@@ -96,6 +97,7 @@ Cross directory:        /home/felix/openrefine-batch/examples/powerhouse-museum/
 Cross projects:         
 OpenRefine heap space:  4G
 OpenRefine version:     2.7rc1
+Docker restart:         restart-true
 Docker container:       6b7eb36f-fc72-4040-b135-acee36948c13
 Output directory:       /home/felix/openrefine-batch/examples/powerhouse-museum/output
 
diff --git a/openrefine-batch.sh b/openrefine-batch.sh
index 7462e13..499ee15 100755
--- a/openrefine-batch.sh
+++ b/openrefine-batch.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-# openrefine-batch.sh, Felix Lohmeier, v0.3, 27.02.2017
+# openrefine-batch.sh, Felix Lohmeier, v0.4, 27.02.2017
 # https://github.com/felixlohmeier/openrefine-batch
 
 # user input
@@ -49,15 +49,21 @@ if [ -z "$6" ]
 fi
 if [ -z "$7" ]
   then
-    inputformat=""
+    restart="restart-true"
   else
-    inputformat="--format=${7}"
+    restart="$7"
 fi
 if [ -z "$8" ]
+  then
+    inputformat=""
+  else
+    inputformat="--format=${8}"
+fi
+if [ -z "$9" ]
   then
     inputoptions=""
   else
-    inputoptions=( "$8" "$9" "${10}" "${11}" "${12}" "${13}" "${14}" "${15}" "${16}" "${17}" "${18}" "${19}" "${20}" )
+    inputoptions=( "$9" "${10}" "${11}" "${12}" "${13}" "${14}" "${15}" "${16}" "${17}" "${18}" "${19}" "${20}" )
 fi
 
 # variables
@@ -73,6 +79,7 @@ echo "Cross projects:         ${crossprojects[@]}"
 echo "OpenRefine heap space:  $ram"
 echo "OpenRefine version:     $version"
 echo "Docker container:       $uuid"
+echo "Docker restart:         $restart"
 echo "Output directory:       $outputdir"
 echo ""
 
@@ -127,12 +134,14 @@ if [ -n "$jsonfiles" ]; then
             sudo docker run --rm --link ${uuid} -v ${configdir}:/data felixlohmeier/openrefine-client -H ${uuid} -f ${jsonfile} ${projectid}
             # statistics
             ps -o start,etime,%mem,%cpu,rss -C java
-            # restart server to clear memory
-            echo "save project and restart OpenRefine server..." 
-            sudo docker stop -t=5000 ${uuid}
-            sudo docker rm ${uuid}
-            sudo docker run -d --name=${uuid} -v ${outputdir}:/data felixlohmeier/openrefine:${version} -i 0.0.0.0 -m ${ram} -d /data
-            until sudo docker run --rm --link ${uuid} --entrypoint /usr/bin/curl felixlohmeier/openrefine-client --silent -N http://${uuid}:3333 | cat | grep -q -o "OpenRefine" ; do sleep 1; done
+            if [ "$restart" = "restart-true" ]; then
+                # restart server to clear memory
+                echo "save project and restart OpenRefine server..." 
+                sudo docker stop -t=5000 ${uuid}
+                sudo docker rm ${uuid}
+                sudo docker run -d --name=${uuid} -v ${outputdir}:/data felixlohmeier/openrefine:${version} -i 0.0.0.0 -m ${ram} -d /data
+                until sudo docker run --rm --link ${uuid} --entrypoint /usr/bin/curl felixlohmeier/openrefine-client --silent -N http://${uuid}:3333 | cat | grep -q -o "OpenRefine" ; do sleep 1; done
+            fi
         done
         # export files
         echo "export to file ${projectid}.tsv..."