Treble bleeds won't work on a Strat or any guitar with a master volume for just the neck pickup, because, being a master control, the bleed will affect all pickups on the guitar. There is a brightening type of cap in series arrangement, something like what is used on the Invader. I'd have to look for a diagram of that. I think ArtieToo might have posted an improved neck clean-up wiring. Try searching past conversations.
You can do it like that solder one leg to the humbucker's hot wire and the other to the volume's center lug. But theres one issue with that.....the cap will then be always connected to the HB hot thru the cap to the volume wiper and the other side of the HB is to ground. So it will be like having a permanent cap in series with a 8k (assuming your HB is 8k) resistor to ground even when the HB is off. So even when using other pickups there will be a slight high end loss wherever the treble bleed cap's range is. The other way you could do it that wouldn't affect the bridge or middle or bridge and middle (but WOULD affect neck+middle) is to make a master tone control so you can use the other side of the switch to cut out the cap completely when in all positions but neck and neck+middle.