How do i animate a curve?

i select a vert and press I but nothing happens

on 2.69

Use AnimAll addon from the addons inside Blender.

edit: you can’t directly animate a curve vertex, except with Animall or with shapekeys as Alexander_Sokerov or Upliner say, but it’s limited, the other solution is to hook the vertices to empties or bones, tell me if you need details

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You can just use shape keys

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oops yes you’re right, it’s also limited though