How to make the normal map influence the flow of a particle brush correctly

[scosie.zero]

Hi there,

When I paint via a paticle brush (Leaks) on the layer above a normal map, and set the normal factor to 1.0, the flow direction of the leaks nerver influenced by the  normal map, why?
Here is the setting of my simple test project:
https://drive.google.com/file/d/0B14-wGuwlU0aaVNkcGRmMjNwZjg/view?usp=sharing
https://drive.google.com/file/d/0B14-wGuwlU0aMXh5SFJWMmFPZ1k/view?usp=sharing
By the way, the leaks brush is in a default setting.

[Sergey Danchenko]

Particle brushes can take into account only the normals that are in a normal map plugged into Additional maps. So, for now you have to export your Normal Channel and re-plug the resulting normal map into Additional maps slot. This new exported normal map will contain details both from your old baked normal map from Additional maps slot AND information that you have painted into the Normal channel.

[scosie.zero]

Oh, I got it!
It works well after I re-plug the resulting normal into additional map slot.
Thank you very much!