bbatsov/projectile — pull request #362 by danielwuz (2014-06-08 20:39:16+00:00)
Title: mentioned that persp-mode should be enabled to use persp-projectile

I noticed some people got error message when using persp-projectile, mainly because they didn't enable perspective mode by the time they call the function, so I think it'd be a good idea to mention that explicitly in README.