diff --git a/doc/src/sgml/ref/pg_rewind.sgml b/doc/src/sgml/ref/pg_rewind.sgml
index 9cdfa902f5..ef0cc280d1 100644
--- a/doc/src/sgml/ref/pg_rewind.sgml
+++ b/doc/src/sgml/ref/pg_rewind.sgml
@@ -130,7 +130,9 @@ PostgreSQL documentation
        <para>
         Specifies a libpq connection string to connect to the source
         <productname>PostgreSQL</> server to synchronize the target with.
-        The server must be up and running, and must not be in recovery mode.
+        The connection must be a normal (non-replication) connection 
+        with superuser access. The server must be up and running, 
+        and must not be in recovery mode.
        </para>
       </listitem>
      </varlistentry>