Update README.md

README.md

@@ -43,6 +43,33 @@ In the Enterprise/Free/Cloud edition of CheckMK you can use the GUI to install t
 
 Nice ;-) Have a look at the [contribution guidelines](CONTRIBUTING.md "Contributing")
 
+---
+### Limitations
+
+- neighbour names in CD/LLDP data have to match the host names in Checkmk
+- local/neighbour interface names have to match the service names in Checkmk
+
+If neighbour names in CD/LLDP data and Checkmk host names don't match, you can configure a mapping in the `create_topology_data.py`. I.e.:
+
+```
+# map inventory host name to CMK host name
+HOST_MAP = {
+    'inventory-host': 'cmkhost',
+    'nexus01': 'NX01',
+    'nexus02': 'NX02',
+    'nexus03': 'NX03',
+}
+```
+**NOTE**: the script will automatically remove the domain name form the neighbour names.
+
+At the same place you can exclude invalid hosts from the topology data
+```
+# drop hosts with invalid names
+DROP_HOSTS = [
+    'not advertised',
+]
+```
+
 ---
 ### Sample Output