diff --git a/docs/book/v3/features/container/factories.md b/docs/book/v3/features/container/factories.md
index e6f73f34..f7a9a787 100644
--- a/docs/book/v3/features/container/factories.md
+++ b/docs/book/v3/features/container/factories.md
@@ -493,6 +493,7 @@ It consumes the following `config` structure:
 ```php
 'templates' => [
     'layout' => 'name of layout view to use, if any',
+    'extension' => 'file extension used by templates; defaults to phtml',
     'map'    => [
         // template => filename pairs
     ],
@@ -505,6 +506,8 @@ It consumes the following `config` structure:
 ]
 ```
 
+- `extension` parameter available since `zendframework/zend-expressive-zendviewrenderer` 2.2.0
+
 When creating the `PhpRenderer` instance, it will inject it with a
 `Zend\View\HelperPluginManager` instance (either pulled from the container, or
 instantiated directly). It injects the helper plugin manager with custom url and