+The API server reads the @config/application.yml@ file, as well as the @config/application.defaults.yml@ file. Values in @config/application.yml@ take precedence over the defaults that are defined in @config/application.defaults.yml@. The @config/application.yml.example@ file is not read by the API server and is provided for installation convenience, only.
+
+Consult @config/application.default.yml@ for a full list of configuration options. Always put your local configuration in @config/application.yml@, never edit @config/application.default.yml@.
+
+h3(#uuid_prefix). uuid_prefix
+
+Define your @uuid_prefix@ in @config/application.yml@ by setting the @uuid_prefix@ field in the section for your environment. This prefix is used for all database identifiers to identify the record as originating from this site. It must be exactly 5 alphanumeric characters (lowercase ASCII letters and digits).
+
+h3(#git_repositories_dir). git_repositories_dir
+
+This field defaults to @/var/lib/arvados/git@. You can override the value by defining it in @config/application.yml@.
+
+Make sure a clone of the arvados repository exists in @git_repositories_dir@.