Disabling flake8 for a particular line exhibiting E266 fails

Please describe how you installed Flake8

pip install --user flake8==2.5.5

Please provide the exact, unmodified output of flake8 --bug-report

(...excerpt of SyntasticCheck...)

functional_tests/tests.py|90 col 9 error| too many leading '#' for block comment [E266]

Please describe the problem or feature

Line 90 contains:

## We use a new browser session to make sure that no information  # noqa: E266

If this is a bug report, please explain with examples (and example code) what you expected to happen and what actually happened.

I expected noqa: E266 at the end of the line to result in the error no longer being reported.