diff --git a/pages/12.home-automation/docs.md b/pages/12.home-automation/docs.md
index b85093a..f007106 100644
--- a/pages/12.home-automation/docs.md
+++ b/pages/12.home-automation/docs.md
@@ -41,4 +41,18 @@ Edit Task 1
 # Step 4. - Test
 `Off` = `http://${IP_ADDRESS}/control?cmd=GPIO,12,0`
 
-`On` = `http://${IP_ADDRESS}/control?cmd=GPIO,12,0`
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+`On` = `http://${IP_ADDRESS}/control?cmd=GPIO,12,0`
+
+# Step 5. - Install Mosquitto on a Raspberry Pi
+### First get the repository package signing key, import it into apt, and remove the key file again:
+```wget http://repo.mosquitto.org/debian/mosquitto-repo.gpg.key
+sudo apt-key add mosquitto-repo.gpg.key
+rm mosquitto-repo.gpg.key```
+
+### Then make the mosquitto repository available to apt:
+```cd /etc/apt/sources.list.d/
+sudo wget http://repo.mosquitto.org/debian/mosquitto-stretch.list
+sudo apt-get update```
+
+### Now we can install the core packages (server & clients):
+```sudo apt-get install mosquitto mosquitto-clients```
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