diff --git a/plugins/modules/nagios.py b/plugins/modules/nagios.py
index 6426975546..5a9c36bc1e 100644
--- a/plugins/modules/nagios.py
+++ b/plugins/modules/nagios.py
@@ -22,6 +22,13 @@ description:
   - The C(nagios) module is not idempotent.
   - All actions require the O(host) parameter to be given explicitly. In playbooks you can use the C({{inventory_hostname}})
     variable to refer to the host the playbook is currently running on.
+  - The module executes commands and needs to be run directly on the Nagios server
+    with a user that has appropriate access rights. It does not use Nagios' HTTP API.
+  - Searches for a I(nagios.cfg) in I(/etc/nagios), I(/etc/nagios2), I(/etc/nagios3), I(/usr/local/etc/nagios),
+    I(/usr/local/groundwork/nagios/etc), I(/omd/sites/oppy/tmp/nagios), I(/usr/local/nagios/etc),
+    I(/usr/local/nagios), I(/opt/nagios/etc), and I(/opt/nagios),
+    or a I(icinga.cfg) in I(/etc/icinga) and I(/usr/local/icinga/etc).
+    (The Nagios configuration file should be readable by the Ansible user.)
 extends_documentation_fragment:
   - community.general.attributes
 attributes: