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Full Idea
Propositional logic can deal with negation, disjunction and conjunction of propositions, but predicate logic goes beyond it to deal with quantifiers, predicates and relations.
Clarification
Disjunction uses 'or'
Gist of Idea
Propositional logic handles negation, disjunction, conjunction; predicate logic adds quantifiers, predicates, relations
Source
Rod Girle (Modal Logics and Philosophy [2000], 1.1)
Book Ref
Girle,Rod: 'Modal Logics and Philosophy' [Acumen 2000], p.1
A Reaction
This is on the first page of an introduction to the next stage, which is to include modal notions like 'must' and 'possibly'.