Update README.md

Added explanation for goharbor#271

Signed-off-by: Thomas Deutsch <[email protected]>

README.md

@@ -256,6 +256,7 @@ The following table lists the configurable parameters of the Harbor chart and th
 | `registry.credentials.username` | The username for accessing the registry instance, which is hosted by htpasswd auth mode.  More details see [official docs](https://github.com/docker/distribution/blob/master/docs/configuration.md#htpasswd). | `harbor_registry_user` |
 | `registry.credentials.password` | The password for accessing the registry instance, which is hosted by htpasswd auth mode.  More details see [official docs](https://github.com/docker/distribution/blob/master/docs/configuration.md#htpasswd).  It is suggested you update this value before installation. | `harbor_registry_password` |
 | `registry.credentials.htpasswd` | The content of htpasswd file based on the value of `registry.credentials.username` `registry.credentials.password`.  Currently `helm` does not support bcrypt in the template script, if the credential is updated you need to manually generated by calling [htpasswd](https://httpd.apache.org/docs/2.4/programs/htpasswd.html): `htpasswd -nbBC10 $username $password`.  More details see [official_docs](https://github.com/docker/distribution/blob/master/docs/configuration.md#htpasswd).|  `harbor_registry_user:$2y$10$9L4Tc0DJbFFMB6RdSCunrOpTHdwhid4ktBJmLD00bYgqkkGOvll3m` |
+| `registry.relativeurls`                                                     | If true, the registry returns relative URLs in Location headers. The client is responsible for resolving the correct URL. Needed if harbor is behind a reverse proxy| `false` |
 | **Chartmuseum**                                                             |
 | `chartmuseum.enabled`                                                       | Enable chartmusuem to store chart                                                                                                                                                                                                                                                                                                               | `true`                          |
 | `chartmuseum.absoluteUrl`                                                   | If true, ChartMuseum will return absolute URLs. The default behavior is to return relative URLs                                                                                                                                                                                                                                                 | `false`                         |