In ver 16.5 you can see comments added to the nets in the PCB editor. To do this try the following.
First highlight your net and right click on it and select "Properity Edit" There are a bunch of options to choose from but some handy properties to use would be "Comments" and voltage.
When you apply the properities to the net and hover over the net your new properties may not display because they need to be included in the data tips for the net.
Go to the tool bar and choose Setup > Data tip customization, When that window opens choose the object type to be Net. Check the name and value fields for the comment field. Next click on the advanced tab and scroll the list until you find the voltage field, check the name and value here also.
Click Ok to exit the menu. When you hover over the net you just added those properties to they should show up on the screen.
Hope this helps...