Clarifying Use of PHOENIX_WORKING_DIR for Setting Working Directory

i am trying to use the new ENV var that lets you set the working dir, if i am reading the code right you need to set PHOENIX_WORKING_DIR environment var, but the error message says

ℹ️ To change, set the `{ENV_WORKING_DIR}` environment variable before importing phoenix.

Am i misreading the code here ?

ENV_WORKING_DIR = "PHOENIX_WORKING_DIR"
working_dir_str = os.getenv(ENV_WORKING_DIR)