diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 56689ba873..03ac480d0c 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -4924,8 +4924,8 @@ int PQsetnonblocking(PGconn *conn, int arg);
        In the nonblocking state, calls to
        <xref linkend="libpq-PQsendQuery"/>, <xref linkend="libpq-PQputline"/>,
        <xref linkend="libpq-PQputnbytes"/>, <xref linkend="libpq-PQputCopyData"/>,
-       and <xref linkend="libpq-PQendcopy"/> will not block but instead return
-       an error if they need to be called again.
+       and <xref linkend="libpq-PQendcopy"/> will not block but the commands are
+       stored locally in the output buffer until it is flushed.
       </para>
 
       <para>