Tweak the readme

php-nginx/README.md

@@ -126,10 +126,24 @@ location / {
 }
 ```
 
-You might need to add some rewrite rules, or you might want to change
-the behavior. In those cases, put a file named `nginx-app.conf` in the
-project root directory. Then the runtime will override the default
-file with the file you provided.
+In this case, index.php is used as the framework front controller.
+
+You may need to change this to something different for your
+project. The Symfony framework, for instance, uses app.php instead of
+index.php.
+
+You might also need to add some nginx rewrite rules. In those cases,
+put a file named `nginx-app.conf` in the project root directory. Then
+the runtime will override the default file with the file you provided.
+
+Here is an example `nginx-app.conf` for the Symfony framework:
+
+```ini
+location / {
+  # try to serve files directly, fallback to the front controller
+  try_files $uri /app.php$is_args$args;
+}
+```
 
 I hope this mechanism can cover most of your use cases, but let us
 know if you found otherwise.