include graphviZ

README.md

@@ -11,8 +11,9 @@ We assume that you have downloaded or cloned the project from GitLab or
  regarding the `data_path`. Instructions on how to rerun the specific version are given below.  
 
 * Install __proj__ and __geos__ on your machine using the console. E.g. for OpenSUSE / leap `zypper install proj`
-* c++ compiler required for cartopy installation
-* Make sure that CUDA 10.0 is installed if you want to use Nvidia GPUs (compatible with TensorFlow 1.13.1).
+* __c++ compiler__ required for cartopy installation
+* __graphviz__ is required to plot the model architecture
+* Make sure that __CUDA 10.0__ is installed if you want to use Nvidia GPUs (compatible with TensorFlow 1.13.1).
 
 Depending on your system (GPU available or not) you can create a virtual environment by executing
 `python3.6 -m venv venv`. Make sure that the venv is activated (`source venv/bin/activate`). Afterwards