diff --git a/Dockerfile b/Dockerfile
index af57b46..1c3e35a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,6 +23,7 @@ RUN apt-get update \
         python-setuptools
 
 RUN curl -L https://bootstrap.pypa.io/get-pip.py | python -
+RUN pip install --ignore-installed Mopidy-Iris
 RUN pip install -U six \
     && pip install markerlib \
     && pip install Mopidy-YouTube \
@@ -30,7 +31,6 @@ RUN pip install -U six \
     && pip install Mopidy-Local-Images \
     && pip install Mopidy-Party \
     && pip install Mopidy-Simple-Webclient \
-    && pip install Mopidy-Iris \
     && pip install Mopidy-MusicBox-Webclient \
     && pip install Mopidy-API-Explorer \
     && pip install Mopidy-Mopify
diff --git a/README.md b/README.md
index b905c38..237b16d 100644
--- a/README.md
+++ b/README.md
@@ -24,20 +24,23 @@ Uses Pulseaudio for audio output.
 ```bash
 docker run \
     --name mopidy \
-    -e PULSE_SERVER=tcp:127.0.0.1:4713 \   # Pulseaudio server
+    -e PULSE_SERVER=tcp:0.0.0.0:4713 \     # Pulseaudio server. Point to external IP of Pulse server
     -v $PWD/media:/media:ro \              # Media files
     -v $PWD/data:/var/lib/mopidy \         # Mopidy data and cache
-    -v $PWD/mopidy.conf:/mopidyconf \      # Override config (for accounts)
+    -v $PWD/mopidy.conf:/mopidy.conf \     # Override config (for accounts)
     -p 6600:6600 \                         # Port for MPD
     -p 6680:6680 \                         # Port for the webinterface
     -p 6681:6681 \                         # (Optional) Port for Iris pusher service
     whhoesj/mopidy
 ```
 
+## Sound
+To get sound, run a Pulseaudio server with tcp enabled. Point the `PULSE_SERVER` environment variable in the container to the external IP of the machine running the Pulseaudio server.
+
 ## Volumes
 To keep the Mopidy data persistent, `/var/lib/mopidy` should be mounted as a volume. The Mopidy user must have write access to this directory. Set this with `chown -R 105 /path/to/data`.
 
-## Accounts
+## Configuration
 To add Spotify, Last.FM etc. accounts, use the `/mopidy.conf` file. Example:
 ```
 [spotify]
@@ -55,5 +58,22 @@ enabled = true
 auth_token =
 ```
 
+This same file can be used to override parts of the default configuration. For example: by default, the file browser in Mopidy is disabled to enable it:
+```
+[file]
+enable = true
+```
+The complete default config can be found in the file [mopidy.conf](./mopidy.conf)
+
 ## Local media
-To play local media files, mount `/media`. All meta data will be stored using Mopidy-Local-SQLite. To scan for new media files, run `docker exec -it mopidy localscan`.
\ No newline at end of file
+To play local media files, mount `/media`. All meta data will be stored using Mopidy-Local-SQLite. To scan for new media files, run `docker exec -it mopidy localscan`.
+
+## Adding extensions
+To add extensions, I advice to override this image by creating your own Dockerfile.
+In the example below, the material webclient is added. To add packages, we switch to the root user, run `pip` to add everything we need and switch back to the `mopidy` user.
+```Dockerfile
+FROM whhoesj/mopidy:latest
+USER root
+RUN pip install 
+USER mopidy
+```