In his book Proper and Improper forcing on page $42$ in the proof of Fact 7.3 on line $4$ Shelah says "where ${\cal S_{\leq \aleph_1}}(A)$" but he never uses this expression. He only uses it with subscript $0$ on the same line: $\leq\aleph_0$ but not $\leq\aleph_1$. So something is wrong here and not as intended ?
