Explain an implication of the vulnerability section.

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@@ -807,6 +807,7 @@
 A [=person=] may not realise when they disclose personal data that
 they are vulnerable or could become vulnerable, and an [=actor=] may have
 no way of knowing that a person is vulnerable.
+System designers should consider this in their system designs.
 
 Some individuals may be more vulnerable to privacy risks or harm as a result of
 collection, misuse, loss, or theft of personal data because: