diff --git a/index.md b/index.md
index e38312a..7c47b80 100644
--- a/index.md
+++ b/index.md
@@ -16,6 +16,7 @@ Manage linux network configuration.
   - [network_hosts_extra](#network_hosts_extra)
   - [network_interfaces](#network_interfaces)
   - [network_ipv6_enabled](#network_ipv6_enabled)
+  - [network_nm_config](#network_nm_config)
   - [network_reboot_enabled](#network_reboot_enabled)
   - [network_resolve_enabled](#network_resolve_enabled)
   - [network_resolve_server](#network_resolve_server)
@@ -98,6 +99,23 @@ network_interfaces:
 network_ipv6_enabled: true
 ```
 
+### network_nm_config
+
+#### Default value
+
+```YAML
+network_nm_config: {}
+```
+
+#### Example usage
+
+```YAML
+network_nm_config:
+  unmanaged: |
+    [keyfile]
+    unmanaged-devices=interface-name:ens*
+```
+
 ### network_reboot_enabled
 
 #### Default value