diff --git a/docs/en/docs/advanced/templates.md b/docs/en/docs/advanced/templates.md
index d9b0ca6f1..4ea33dc04 100644
--- a/docs/en/docs/advanced/templates.md
+++ b/docs/en/docs/advanced/templates.md
@@ -121,6 +121,17 @@ In this example, it would link to a CSS file at `static/styles.css` with:
 
 And because you are using `StaticFiles`, that CSS file would be served automatically by your **FastAPI** application at the URL `/static/styles.css`.
 
+!!! note
+    The url generated by `url_for` is a full absolute URL, including the protocol. That may not work in a reverse proxy situation, like Traefik or GitHub Codespaces.
+    If you would instead like it to generate relative URLs, you can override the `url_for` template function in your Python code:
+
+    ```python
+    templates.env.globals["url_for"] = app.url_path_for
+    ```
+
+    Another way to affect the generated URLs is to customize `uvicorn` with arguments like `proxy-headers`, `root-path`, and `forwarded-allow-ips`.
+    See <a href="https://www.uvicorn.org/settings/#http">uvicorn's docs on settings</a>.
+
 ## More details
 
 For more details, including how to test templates, check <a href="https://www.starlette.io/templates/" class="external-link" target="_blank">Starlette's docs on templates</a>.