diff --git a/changelogs/fragments/401_document_module_default_values.yml b/changelogs/fragments/401_document_module_default_values.yml
new file mode 100644
index 0000000..8a631dc
--- /dev/null
+++ b/changelogs/fragments/401_document_module_default_values.yml
@@ -0,0 +1,4 @@
+---
+trivial:
+- acl - document default value for the ``entry`` parameter
+- rhel_rpm_ostree - document default value for the ``name`` parameter
diff --git a/plugins/modules/acl.py b/plugins/modules/acl.py
index a2e3d6d..119520e 100644
--- a/plugins/modules/acl.py
+++ b/plugins/modules/acl.py
@@ -44,6 +44,7 @@ options:
     description:
     - The actual user or group that the ACL applies to when matching entity types user or group are selected.
     type: str
+    default: ""
   etype:
     description:
     - The entity type of the ACL to apply, see C(setfacl) documentation for more info.
diff --git a/plugins/modules/rhel_rpm_ostree.py b/plugins/modules/rhel_rpm_ostree.py
index e5e8f2b..0976e02 100644
--- a/plugins/modules/rhel_rpm_ostree.py
+++ b/plugins/modules/rhel_rpm_ostree.py
@@ -35,6 +35,7 @@ options:
     aliases: [ pkg ]
     type: list
     elements: str
+    default: []
   state:
     description:
       - Whether to install (C(present) or C(installed), C(latest)), or remove (C(absent) or C(removed)) a package.