Toyota PRIUS Manual page 160

1-4. Opening, closing and locking the doors
NOTICE
 Back door damper stays
The back door is equipped with damper stays that hold the back door in
place.
Observe the following precautions.
Failure to do so may cause damage to the back door damper stay, resulting
in malfunction.
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PRIUS PHV_OM_OM47831E_(EE)
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Damper stays 
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Do not attach any foreign objects, such
as stickers, plastic sheets, or adhesives
to the damper stay rod.
Do not touch the damper stay rod with
gloves or other fabric items.
Do not attach any accessories other
than genuine Toyota parts to the back
door.
Do not place your hand on the damper
stay or apply lateral forces to it.