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-rw-r--r--doc/src/sgml/config.sgml2
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 8683f0bdf53..f1ab614575a 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -4715,6 +4715,8 @@ ANY <replaceable class="parameter">num_sync</replaceable> ( <replaceable class="
wait for replies from,
and <replaceable class="parameter">standby_name</replaceable>
is the name of a standby server.
+ <replaceable class="parameter">num_sync</replaceable>
+ must be an integer value greater than zero.
<literal>FIRST</literal> and <literal>ANY</literal> specify the method to choose
synchronous standbys from the listed servers.
</para>