diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 0ee018e..2989aae 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -966,6 +966,17 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       </listitem>
      </varlistentry>
 
+     <varlistentry id="libpq-connect-replication" xreflabel="replication">
+      <term><literal>replication</literal></term>
+      <listitem>
+      <para>
+       Connect with Streaming Replication Protocol (see <xref linkend="protocol-replication">).
+       This allows the value to be either boolean or the string 'database'.
+       The latter connects to a specific database given by <literal>dbName</>.
+      </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="libpq-connect-user" xreflabel="user">
       <term><literal>user</literal></term>
       <listitem>