Update README.md

README.md

@@ -21,7 +21,16 @@ $ sudo pip install numpy scipy nibabel
 The LD_LIBRARY_PATH has to be set to the pyvista library. To do this run
 $ export LD_LIBRARY_PATH="Path to directory"/vviewer/vviewer/pyvista/lib/
 in the terminal that you want to run the viewer in.
-For the installation
+For the installation.
+
+If you want to start the vviewer directly from the terminal, you will have to edit your ~/.bashrc file, adding this line:
+
+export PATH=<directory>:$PATH
+
+substituting <directory> with the directory, where you have vviewer.py. 
+Then you can launch the viewer as:
+
+vviewer.py -in bla.nii -z overlay.nii
 
 ## Setup For Mac