Tropical Storm Don: How will Don affect the Texas Drought?

The big question throughout Don's existence has been what it will do to the Texas drought.
The thing is, is that the Texas drought is hard as a rock right now. With torrential rainfall in South Texas, all of the water will just flow off the ground since the ground is so hard it cannot absorb the rain. What's needed is a light, continuous rain that will soak into the ground.

There will be significant rain mainly in North Mexico, while Texas will get a very small amount.
In summary, it won't affect the Texas drought majorly.