diff --git a/group_vars/model_dlink_covr_x1860_a1.yml b/group_vars/model_dlink_covr_x1860_a1.yml
index 1be42f69..44b9bd2e 100644
--- a/group_vars/model_dlink_covr_x1860_a1.yml
+++ b/group_vars/model_dlink_covr_x1860_a1.yml
@@ -8,6 +8,8 @@ dsa_ports:
   - internet
   - ethernet
 
+# Mac address can be read with the following command:
+# cat /dev/mtdblock$(grep -w 'config2' /proc/mtd | sed -n 's/^mtd\([0-9]\+\):.*/\1/p') | grep -o 'factory_mac=[^ ]*' | cut -d= -f2
 requires_mac_override: true
 
 wireless_devices:
diff --git a/group_vars/model_mikrotik_sxtsq_2_lite.yml b/group_vars/model_mikrotik_sxtsq_2_lite.yml
index 07d19117..ffb45531 100644
--- a/group_vars/model_mikrotik_sxtsq_2_lite.yml
+++ b/group_vars/model_mikrotik_sxtsq_2_lite.yml
@@ -6,6 +6,8 @@ model_nice: SXTsq Lite2
 
 int_port: eth0
 
+# Mac address can be read with the following command:
+# cat /sys/firmware/mikrotik/hard_config/mac_base
 requires_mac_override: true
 
 wireless_devices:
diff --git a/group_vars/model_mikrotik_sxtsq_5_ac.yml b/group_vars/model_mikrotik_sxtsq_5_ac.yml
index 02841775..a7469b77 100644
--- a/group_vars/model_mikrotik_sxtsq_5_ac.yml
+++ b/group_vars/model_mikrotik_sxtsq_5_ac.yml
@@ -10,6 +10,8 @@ model__packages__to_merge:
 dsa_ports:
   - lan
 
+# Mac address can be read with the following command:
+# cat /sys/firmware/mikrotik/hard_config/mac_base
 requires_mac_override: true
 
 wireless_devices:
diff --git a/group_vars/model_netgear_wax202.yml b/group_vars/model_netgear_wax202.yml
index 744b086a..c3b48888 100644
--- a/group_vars/model_netgear_wax202.yml
+++ b/group_vars/model_netgear_wax202.yml
@@ -9,6 +9,8 @@ dsa_ports:
   - lan2
   - lan3
 
+# Mac address can be read with the following command:
+# cat /dev/mtdblock$(grep -w 'Config' /proc/mtd | sed -n 's/^mtd\([0-9]\+\):.*/\1/p') | grep -o 'mac=[^ ]*' | cut -d= -f2
 requires_mac_override: true
 
 wireless_devices: