diff --git a/README.md b/README.md
index 58e7e08..f006bcb 100644
--- a/README.md
+++ b/README.md
@@ -20,8 +20,9 @@ Also, this is the project for my Bachelor thesis.
 
 Run `pip install -e .`. You can use a virtualenv if you wish (recommended).
 
-A demo is located in `./poor_mans_visualisation.py`, if that runs, everything
-should be working.
+Birdvisu can then be run just as `visu`. Other ways include running `python -m
+birdvisu` or `./visu.py` from this directory, all of them are functionally
+equivalent.
 
 ## Documentation
 
diff --git a/birdvisu/graphics_items.py b/birdvisu/graphics_items.py
index 4db3e5a..20a9eae 100644
--- a/birdvisu/graphics_items.py
+++ b/birdvisu/graphics_items.py
@@ -12,8 +12,15 @@ def _addrs_as_str(addrs):
 	if isinstance(addrs, IPv4Network) or isinstance(addrs, IPv6Network): return str(addrs)
 	return '\n'.join(str(a) for a in addrs)
 
+"""Z-value guide:
+	- Vertices at Z=200
+	- Edges at Z=100
+	- Highlights at Z reduced by 10.
+	"""
+
+
 # TODO: we MAY WISH TO use QGraphicsItemGroup.
-# TODO: Do not duplicate so much code!
+# TODO: Do not duplicate so much code! (But it is only two times, so it counts :-))
 # TODO: tooltips?
 class RouterGraphicsItem(QGraphicsItem):
 	default_style = {
@@ -25,7 +32,7 @@ class RouterGraphicsItem(QGraphicsItem):
 		self.window = window
 
 		size = 30
-		self.icon = QGraphicsRectItem(-size/2, -size/2, size, size, parent=self)
+		self.icon = QGraphicsRectItem(-size/2, -size/2, size, size, parent=self) # Should use Cisco icon for router…
 		self.icon.setZValue(200)
 		self.icon.setBrush(QBrush(QColor('yellow')))
 		self.label = QGraphicsSimpleTextItem(parent=self.icon)
@@ -74,7 +81,7 @@ class RouterGraphicsItem(QGraphicsItem):
 	
 	def contextMenuEvent(self, evt):
 		menu = QMenu(self.window)
-		tree_act = QAction('Show routing tree', self.window)
+		tree_act = QAction('Show routing DAG', self.window)
 		menu.addAction(tree_act)
 		path_act = object()
 		if self.window.mode == self.window.Mode.ShortestPathDAG:
@@ -103,7 +110,7 @@ class NetworkGraphicsItem(QGraphicsItem):
 		self.window = window
 
 		size = 40
-		self.icon = QGraphicsRectItem(-size/2, -size/2, size, size, parent=self)
+		self.icon = QGraphicsRectItem(-size/2, -size/2, size, size, parent=self) # TODO: Cisco cloud
 		self.icon.setZValue(200)
 		self.icon.setBrush(QBrush(QColor('gray')))
 		self.label = QGraphicsSimpleTextItem(parent=self.icon)
@@ -153,7 +160,7 @@ class NetworkGraphicsItem(QGraphicsItem):
 
 	def contextMenuEvent(self, evt):
 		menu = QMenu(self.window)
-		tree_act = QAction('Show routing tree', self.window)
+		tree_act = QAction('Show routing DAG', self.window)
 		menu.addAction(tree_act)
 		path_act = object()
 		if self.window.mode == self.window.Mode.ShortestPathDAG: