Update README.md

README.md

@@ -16,7 +16,7 @@ partial differential equation (PDE) with free boundary. The PDE is given by:
 -V\geq 0, \quad \tilde{x}^\intercal Q\tilde{x} - J + \tilde{x}^\intercal A^\intercal\nabla V + \frac{1}{2}\Delta V\geq 0, \quad \forall \tilde{x}.
 ```
 The solution to this PDE is the relative value function $`V:\tilde{x}\rightarrow\mathbb{R}`$, and the optimal sampling policy is to trigger sampling whenever $`V(\tilde{x})=0`$ holds.
-For more details we refer to our [article](ecc2019_paper.pdf).
+For more details we refer to our [article](ecc19_paper.pdf).
 
 # Requirements
 The demo code has been tested for Julia v0.6, which can be downloaded [here](https://julialang.org/downloads/oldreleases.html). The following packages are required:
@@ -146,6 +146,8 @@ validation = true
 plotting = true
 search_c = true
 ```
+**Note: currently plotting only works for 2D systems.**
+
 ## Changing the System
 You can change the system matrix $`A`$, the (diagonal) quadratic cost weight
 matrix $`Q`$ and the total cost $`J`$ by changing the following variables in