diff --git a/manifests/wsgi/apache.pp b/manifests/wsgi/apache.pp
index 04b120d..438ff34 100644
--- a/manifests/wsgi/apache.pp
+++ b/manifests/wsgi/apache.pp
@@ -116,9 +116,17 @@ class placement::wsgi::apache (
   $access_log_file           = false,
   $access_log_format         = false,
   $error_log_file            = undef,
-  $vhost_custom_fragment       = undef,
+  $vhost_custom_fragment     = undef,
 ) {
 
+  if $api_port == 80 {
+    warning('The default api_port will be changed from 80 to 8778 in a future release.')
+  }
+
+  if $path == '/placement' {
+    warning('The default path will be changed from /placement to / in a future release.')
+  }
+
   include placement::params
   include apache
   include apache::mod::wsgi
diff --git a/releasenotes/notes/prep-change-port-and-path-79b34493e2bd4b57.yaml b/releasenotes/notes/prep-change-port-and-path-79b34493e2bd4b57.yaml
new file mode 100644
index 0000000..0fc826d
--- /dev/null
+++ b/releasenotes/notes/prep-change-port-and-path-79b34493e2bd4b57.yaml
@@ -0,0 +1,10 @@
+---
+upgrade:
+  - |
+    Defaults of the following parameters will be changed in a future release.
+    Please set the parameter explicitly to keep the value during upgrade.
+    Also it is likely that endpoint parameters in ``nova::keystone::auth``
+    should be also updated.
+
+    - ``placement::wsgi::apache::api_port``: from ``80`` to ``8778``
+    - ``placement::wsgi::apache::path``: from ``/placement`` to ``/``