Update README.md

Author: mtfishman

README.md

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 Finite MPS and MPO methods based on ITensor (ITensors.jl).
 
-This package currently re-exports the MPS and MPO functionality of the [ITensors.jl](https://github.com/ITensor/ITensors.jl) and [ITensorTDVP.jl](https://github.com/ITensor/ITensorTDVP.jl) packages, including applications like DMRG, TDVP, applying MPO to MPS, applying gates to MPS and MPO, etc.
+This package currently re-exports the MPS and MPO functionality of the [ITensors.jl](https://github.com/ITensor/ITensors.jl), including functionality like DMRG, applying MPO to MPS, applying gates to MPS and MPO, etc.
 
 See the [ITensor documentation](https://itensor.github.io/ITensors.jl/dev) for guides and examples on using this package.
 
+Additionally, it re-exports the functionality of the [ITensorTDVP.jl](https://github.com/ITensor/ITensorTDVP.jl) package, which provides other DMRG-like MPS solvers such as TDVP and MPS linear equation solving.
+
 ## Upgrade guide
 
 The goal will be to move the MPS and MPO code from the ITensors.jl package, along with all of the code from the [ITensorTDVP.jl](https://github.com/ITensor/ITensorTDVP.jl) package, into this repository. If you are using any MPS/MPO functionality of ITensors.jl, such as the `MPS` and `MPO` types or constructors thereof (like `randomMPS`), `OpSum`, `siteinds`, `dmrg`, `apply`, etc. you should install the ITensorMPS.jl package with `import Pkg; Pkg.add("ITensorMPS")` and add `using ITensorMPS` to your code. Additionally, if you are currently using [ITensorTDVP.jl](https://github.com/ITensor/ITensorTDVP.jl), you should replace `using ITensorTDVP` with `using ITensorMPS` in your codes.