A method of using a rail clip assembly to connect a horizontal fence rail to a vertical fence post. The rail clip assembly includes a housing that is slidably engaged with at least one mounting spacer and a first leg of an L-shaped mounting bracket until a second leg of the bracket abuts the underside of the housing. A first fastener is screwed through the first leg and mounting spacer and into the side wall of the fence post. An end of the rail is inserted into the housing and a second fastener is screwed through the second leg, the housing and the end of the rail. The rail clip assembly aids in preventing the rail from disengaging from the housing when a lateral force is applied to the rail.