How to update Symfony routing on an external server with FTP upload only?

i'm currently adapting an existing Symfony project to my needs and would 开发者_JAVA技巧like to add some static pages. As far as i know, i can add lines to the rounting.yml but after the upload the rountings won't work. Do i have to run any Symfony command and upload other files to update the routings?

Thanks everybody, Sebastian

All yml files are cached in the prod environment for speed. You need to clear your cache - simply delete the contents of the cache directory.