Additive or multiplicative attention?

[Ataxias]

In the "Attentional Interfaces" section, there is a reference to "Bahdanau, et al. 2014: Neural machine translation by jointly learning to align and translate" (figure). In that paper, the attention vector is calculated through a feed-forward network, using the hidden states of the encoder and decoder as input (this is called "additive attention"). However, the schematic diagram of this section shows that the attention vector is calculated by using the dot product between the hidden states of the encoder and decoder (which is known as multiplicative attention). I believe that a short mention / clarification would be of benefit here.