Update README.md

README.md

 [PACKAGE]: ../../raw/master/mkp/inv_ipv4_addresses-0.0.4-20240407.mkp "inv_ipv4_addresses-0.0.4-20240407.mkp"
 # Inventory of IPv4 addresses
 
-The plugin adds the IPv4 addresses of a device monitored via SNMP to the inventory.
+The plugin adds the IP-addresses information to the inventory for devices monitored via SNMP. The plugin supports IPv4 and IPv6.
+
+It adds the hostlabels
+- `nvdct/l3v4_topology:host` if the host has one IPv4 address, except localhost
+- `nvdct/l3v4_topology:router` if the thost has more than one IPv4 address, except localhost
 
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