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-rw-r--r--doc/src/sgml/libpq.sgml12
1 files changed, 12 insertions, 0 deletions
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 0fb728e2b28..0306a76161b 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -2944,6 +2944,18 @@ const char *PQsslAttribute(const PGconn *conn, const char *attribute_name);
</para>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><literal>alpn</literal></term>
+ <listitem>
+ <para>
+ Application protocol selected by the TLS Application-Layer
+ Protocol Negotiation (ALPN) extension. The only protocol
+ supported by libpq is <literal>TBD-pgsql</literal>, so this is
+ mainly useful for checking whether the server supported ALPN or
+ not. Empty string if ALPN was not used.
+ </para>
+ </listitem>
+ </varlistentry>
</variablelist>
</para>