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<chapter id="libpq">
When <parameter>async</> is true (not zero), <function>PQgetCopyData</>
will not block waiting for input; it will return zero if the <command>COPY</command> is still
in progress but no complete row is available. (In this case wait for
-read-ready before trying again; it does not matter whether you call
-<function>PQconsumeInput</>.) When <parameter>async</> is
+read-ready and then call <function>PQconsumeInput</> before calling
+<function>PQgetCopyData</> again.) When <parameter>async</> is
false (zero), <function>PQgetCopyData</> will block until data is available
or the operation completes.
</para>