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

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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.