diff --git a/changelogs/fragments/193_firewalld.yml b/changelogs/fragments/193_firewalld.yml
new file mode 100644
index 0000000..088a268
--- /dev/null
+++ b/changelogs/fragments/193_firewalld.yml
@@ -0,0 +1,3 @@
+---
+trivial:
+- firewalld - specify unit for ``timeout`` parameter in docs (https://github.com/ansible-collections/ansible.posix/issues/193).
diff --git a/plugins/modules/firewalld.py b/plugins/modules/firewalld.py
index c87dd36..818ed20 100644
--- a/plugins/modules/firewalld.py
+++ b/plugins/modules/firewalld.py
@@ -99,7 +99,7 @@ options:
     choices: [ absent, disabled, enabled, present ]
   timeout:
     description:
-      - The amount of time the rule should be in effect for when non-permanent.
+      - The amount of time in seconds the rule should be in effect for when non-permanent.
     type: int
     default: 0
   masquerade: