when I add a file pdm.toml for python 3 project,

[pypi]
verify_ssl = true

# https://github.com/pdm-project/pdm/discussions/2406
[tool.pdm.resolution]
respect-source-order = true

[[tool.pdm.source]]
name = "pypi"
url = "http://pypi.org/simple"
verify_ssl = true

[[tool.pdm.source]]
name = "fallback"
url = "http://pypi.org/simple"
verify_ssl = true

the toml file shows warning like this:

Additional properties are not allowed ('tool' was unexpected)Even Better TOML
Additional properties are not allowed ('tool' was unexpected)Even Better TOML
Additional properties are not allowed ('tool' was unexpected)Even Better TOML

Am I missing something? what should I do to fixed this issue?