Update slimming instructions in Readme

Change-Id: I1d74e05f613a94dcfecb225199cffdef212c2cda
diff --git a/README.md b/README.md
index 293d78c..52f44c4 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,7 @@
 The web user interface will than be available for example at <http://localhost:3000>
 
 ## Web Service API
+
 In addition to the web user interface, derekovecs also provides a web api which is however still very unsystematic and **not stable**. To figure out the meaning of still undocumented result components, have a look at the table head mouse-overs in the GUI or at the source code around [here](https://korap.ids-mannheim.de/gerrit/plugins/gitiles/ids-kl/derekovecs/+/refs/heads/master/templates/index.html.ep#684).
 
 | Command                   | Parameters                      | Description                                                       |
@@ -129,7 +130,7 @@
 ### Optional: Slim down image using [Slim(toolkit)](https://github.com/slimtoolkit/slim)
 
 ```bash
-slim build --new-expose=3000 --http-probe-ports=3000  --include-path /usr/local --mount $(pwd)/config:/config:z idscorpuslinguistics/derekovecs
+slim build --new-expose=3000 --http-probe-ports=3000  --include-path /usr/local --mount ./example-models:/example-models:z --env MOJO_CONFIG=/example-models/example-docker.conf idscorpuslinguistics/derekovecs
 ```
 
 Will build an image `ids-kl/derekovecs.slim` reduced to ~25% of the original size.