I can't bring it to mind, actually. It might have been before I started reading his blog, possibly?

I can't find a link now. At at least one point I read through the archives so I've read it all by now :) As I recall, he was talking about maintaining a simple PERL module or similar and people kept saying "why don't you just add this bit of functionality, look it's easy I'll do it" and in that or another post, also mentioned the difficulty of maintaining some documentation with a similar "look, i'll just add tthis bit, it'll be useful" problem, where each individual request is reasonable, but in aggregate makes the module so unweildy no-one wants to bother ot use it.