Index: l10n.php
===================================================================
--- l10n.php	(revision 12592)
+++ l10n.php	(working copy)
@@ -367,6 +367,9 @@
  * @param string $plugin_rel_path Optional. Relative path to WP_PLUGIN_DIR. This is the preferred argument to use. It takes precendence over $abs_rel_path
  */
 function load_plugin_textdomain( $domain, $abs_rel_path = false, $plugin_rel_path = false ) {
+	if ( false !== $abs_rel_path )
+		_deprecated_argument( __FUNCTION__, '2.7' );
+
 	$locale = get_locale();
 
 	if ( false !== $plugin_rel_path	)