scikit-image/scikit-image — pull request #1022 by jni (2014-06-11 10:31:10+00:00)
Title: Clarify `mask` argument in `medial_axis` docstring

Addresses one of the points raised in [this thread](https://groups.google.com/d/msg/scikit-image/XRQy1arQ5E0/GDnYdHrtu4kJ) on the mailing list.