-libgl1-mesa-dri # necessary for OpenGL 3D acceleration to work
-libglu1-mesa # necessary for OpenGL 3D acceleration to work
-linux-headers-amd64 # necessary to build proper nvidia-driver module
-primus
+libgl1-mesa-dri # tested as necessary for OpenGL 3D acceleration to work
+libglu1-mesa # tested as necessary for OpenGL 3D acceleration to work
+linux-headers-amd64 # tested as necessary to build proper nvidia-driver module
+primus # bridge by which bumblebee will deliver Nvidia-renderend content to Intel card