How should I apply Ambient Occlusion from greyscale AO maps?

Question

I've seen many tutorials on SSAO, but none for simple ambient occlusion maps.

I can see myself working things out alone, as AO maps are simple greyscale maps that indicate where there should be more lighting and where less, right? Something like

float ao = texture(ambientOcclusionMap, uvCoords);
vec3 lighting = ambient + (diffuse + specular) * ao; 

Is there something more to it?

Answer 1

Correct approach is to multiply ambient component with AO:

vec3 lighting = ambient * ao + diffuse + specular;

** it is not a coincidence, that both items have the the word "ambient" in them ;-)