Updated Running changedetection.io behind a reverse proxy (markdown)

Running-changedetection.io-behind-a-reverse-proxy.md

@@ -1,3 +1,6 @@
+Before moving on, if your endpoint looks like this: `https://domain.com/subdirectory_dedicated_to_changedetector`
+Please review [this article](https://github.com/dgtlmoon/changedetection.io/wiki/Running-changedetection.io-behind-a-reverse-proxy-sub-directory) then come back here
+
 You need to enable the `USE_X_SETTINGS` environment variable in changedetection.io for it to respect HTTP headers sent from the reverse proxy (such as `Host`, `X-Forwarded-Prefix` and `X-Forwarded-Proto`).
 
 The easiest way is to create an extra docker-compose YML file and run it with the shipped version.