diff --git a/README.md b/README.md
index b726aa9..351e3e2 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ Install
 * change working directory: `cd corax.ansible`
 * setup virtualenv: `virtualenv --python=python3 .`
 * bootstrap Ansible environment: `./bin/pip install -r requirements.txt`
-* install Ansible Galaxy role: `./bin/ansible-galaxy install -r ansible-galaxy.yml`
+* install Ansible Galaxy role: `./bin/ansible-galaxy install -r requirements.yml`
 
 Run
 ===
diff --git a/group_vars/grafana_server.yml b/group_vars/grafana_server.yml
new file mode 100644
index 0000000..231b787
--- /dev/null
+++ b/group_vars/grafana_server.yml
@@ -0,0 +1,3 @@
+---
+unattended_upgrades__origins:
+      - 'site=apt.grafana.com,component=main'
diff --git a/group_vars/matrix_server.yml b/group_vars/matrix_server.yml
new file mode 100644
index 0000000..06e8de7
--- /dev/null
+++ b/group_vars/matrix_server.yml
@@ -0,0 +1,3 @@
+---
+unattended_upgrades__origins:
+      - 'o=matrix.org,n=${distro_codename}'
diff --git a/inventory/corax b/inventory/corax
index f9abd3c..c9942e0 100644
--- a/inventory/corax
+++ b/inventory/corax
@@ -32,6 +32,12 @@ wiki-00.unterberg.radiocorax.de
 [time_server]
 ntp-00.unterberg.radiocorax.de
 
+[grafana_server]
+grafana-00.unterberg.radiocorax.de
+
+[matrix_server]
+chat-00.unterberg.radiocorax.de
+
 [monitoring_server]
 monitor-00.unterberg.radiocorax.de