diff --git a/reference/pgsql/functions/pg-put-line.xml b/reference/pgsql/functions/pg-put-line.xml
index f2c1de8e07..2d73538760 100644
--- a/reference/pgsql/functions/pg-put-line.xml
+++ b/reference/pgsql/functions/pg-put-line.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.4 $ -->
+<!-- $Revision: 1.5 $ -->
 <!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.20 -->
   <refentry id="function.pg-put-line">
    <refnamediv>
@@ -49,6 +49,15 @@
       </programlisting>
      </example>
     </para>
+    <warning>
+     <para>
+      Use of the <function>pg_put_line</function> causes most large object
+      operations, including <function>pg_lo_read</function> and
+      <function>pg_lo_tell</function>, to subsequently fail. You can use
+      <function>pg_copy_from</function> and <function>pg_copy_to</function>
+      instead.
+     </para>
+    </warning>
     <para>
      See also <function>pg_end_copy</function>.
     </para>