Pencil and paper. No elaborate scheme needed. Write a word or two. Arrows. This is just a temporary hand-rail for support, not a documented history. If you try

Pencil and paper. No elaborate scheme needed. Write a word or two. Arrows. This is just a temporary hand-rail for support, not a documented history. If you try to make this more elaborate / formal, you lose the flow. Have a simple system. Use Google bookmarks from the g-toolbar to make sure you don't lose links.