diff --git a/apps/docs/content/php/how-to/customize-runtime.mdx b/apps/docs/content/php/how-to/customize-runtime.mdx
index ba74d975..4607e907 100644
--- a/apps/docs/content/php/how-to/customize-runtime.mdx
+++ b/apps/docs/content/php/how-to/customize-runtime.mdx
@@ -50,3 +50,18 @@ To invalidate the custom runtime cache go to `yyy`
 **// TODO screenshot**
 
 When the custom runtime cache is used, Zerops doesn't create a prepare runtime container and executes the deployment of your application directly.
+
+### Overwrite php.ini files
+
+You can override PHP configuration directives by setting environment variables in your `zerops.yml` file.
+
+For example, to adjust PHP's maximum POST size limit, you would set the `post_max_size` directive like this:
+
+```yml
+zerops:
+  - setup: app
+    run:
+      base: php-nginx@8.3
+      envVariables:
+        PHP_INI_post_max_size: 10M
+```