Why does Juliet smile when Jack says he gave Kate a wink?

In episode 2 of season 4, Confirmed Dead, Jack and Kate are being held at gunpoint in the jungle with Daniel and Miles. Jack spots Juliet and Sayid coming to rescue them and winks at Kate to let her know its okay. Then walking through the jungle, Kate says, "Youu could have filled me on the plan." And Jack says, "I gave you that wink..." and Juliet smiles. Why does she do that?

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