Holy water pamphlet

The Holy Water Pamphlet is a note that the Lone Wanderer receives in Megaton when doing the Broken Steel side quest Holy Water.

The note can be received from an NPC in Megaton or alternatively it can be found pinned to every door in Megaton, including the door to your Megaton house and the front gates..

Bugs
Found out the PC version.
 * If you stand in front of your door house and take & read the note saving the game and then reloading the game, the note will appear again. The same thing will happen on any other door that the note is on.

It may not be a bug. On the 360 version, every so often another one can be found pinned to the door of your house.