diff --git a/README.md b/README.md
index 3581f7e..e47655b 100644
--- a/README.md
+++ b/README.md
@@ -25,11 +25,16 @@ dhcp range is 10.10.0.20-10.10.0.80
 
 ## useful commands
 
-```
+```bash
 for i in `seq 136 142`; do echo $i; ssh root@10.10.0.$i reboot; done
 for i in `seq 100 142`; do echo $i; ssh root@10.10.0.$i "sh -c 'nohup stress -c 8 > /dev/null 2>&1 &'"; done
 for i in `seq 100 105`; do echo $i; ssh root@10.10.0.$i "sh -c 'nohup killall stress > /dev/null 2>&1 &'"; done
 for i in `seq 100 143`; do echo $i; ssh root@10.10.0.$i "sh -c 'nohup poweroff > /dev/null 2>&1 &'"; done
 
+
+# install required roles from ansible-galaxy:
+ansible-galaxy install -r requirements.yml
+
+# run ansible-playbook only on node42 with only tagged roles hostname and telegraf
 ansible-playbook  -i inventory site.yml --limit "node42" --tags "hostname,telegraf" -K --ask-pass
-```
\ No newline at end of file
+```
diff --git a/ansible-ctdo/requirements.yml b/ansible-ctdo/requirements.yml
new file mode 100644
index 0000000..fcc4345
--- /dev/null
+++ b/ansible-ctdo/requirements.yml
@@ -0,0 +1,7 @@
+# install some required roles with 
+# ansible-galaxy install -r requirements.yml
+
+
+- src: dresden-weekly.network-interfaces
+
+- src: dj-wasabi.telegraf