Reword docstring to match code
@@ -264,8 +264,9 @@ class Resolver(BaseResolver):
# type: (InstallRequirement) -> None
"""Ensure that if a link can be found for this, that it is found.
- Note that req.link may still be None - if Upgrade is False and the
- requirement is already installed.
+ Note that req.link may still be None - if the requirement is already
+ installed and not needed to be upgraded based on the return value of
+ _is_upgrade_allowed().
If preparer.require_hashes is True, don't use the wheel cache, because
cached wheels, always built locally, have different hashes than the
