diff --git a/docs/how_tos/how_to_secure_network.md b/docs/how_tos/how_to_secure_network.md
index f9c34265..9df560c4 100644
--- a/docs/how_tos/how_to_secure_network.md
+++ b/docs/how_tos/how_to_secure_network.md
@@ -1,16 +1,25 @@
 # How to secure your Zigbee network
 By default your Zigbee network isn't as secured as possible. The following settings are recommeded to apply to your configuration.
 
-## Disabled joining
-To disable joining it's important that `permit_join: false` is set in your `configuration.yaml`.
+## Disable joining
+To disable joining it's important that `permit_join: false` is set in your `configuration.yaml`. Otherwise rogue devices are able to join allowing them to send and receive Zigbee traffic.
 
 ## Change Zigbee network encryption key
 **Changing the key requires repairing of all devices!**
 
-Zigbee2mqtt uses a default encryption key. Therefore it is recommended to use a different one.  To use a different encryption key add the following to you `configuration.yaml`:
+Zigbee2mqtt uses a known default encryption key. Therefore it is recommended to use a different one. To use a different encryption key add the following to your `configuration.yaml`:
 
-**Do not use the following key.**
+**Do not use this exact key.**
 ```
 advanced:
-  network_key: [7, 3, 5, 7, 9, 11, 13, 15, 0, 2, 4, 6, 8, 11, 12, 13],
+  network_key: [7, 3, 5, 7, 9, 11, 13, 15, 0, 2, 4, 6, 8, 11, 12, 13]
+```
+
+The network encryption key size is `128-bit` which is essentially 16 decimal values between `0` and `255` or 16 hexadecimal values between `0x00`and `0xFF`.
+
+If you need to transform your decimals to hexadecimals (or vice versa) please use a [converter](https://www.binaryhexconverter.com/decimal-to-hex-converter). Example: 92 (decimal) would become 5C (hexadecimal).
+
+You can generate a valid key with the following command in most linux systems:
+```
+dd if=/dev/urandom bs=1 count=16 2>/dev/null | od -A n -t x1 | awk '{printf "["} {for(i = 1; i< NF; i++) {printf "0x%s, ", $i}} {printf "0x%s]\n", $NF}'
 ```