"Forget" enemy designs after my scanning ship moves?!

[MegaTrain]

I've got a cloaked vessel with Long-Range Scanners I, and when I approach an enemy (or ally, for that matter) vessel, I can see the design of the enemy ship. But once the ship moves away, I can no longer see the design!

It guess it make sense that I shouldn't be able any longer to click on the ship to see its components, but even when I go into Designs, Enemy Ships, the vessel classes are no longer listed!

Does this make sense? This means I have to actually WRITE DOWN ON A PIECE OF PAPER any designs I am particularly interested in remembering.

Is this a bug? Or is there a "remember this design" button I am missing?

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-MegaTrain-
Athlon 1.3 GHz running at 1.6 GHz on an iWill KK266