diff --git a/doc/keywords.txt b/doc/keywords.txt
index e6dd788..a0cbe3d 100644
--- a/doc/keywords.txt
+++ b/doc/keywords.txt
@@ -36,7 +36,9 @@ BOOST_PP_LIST_FILTER
 BOOST_PP_LIST_FIRST
 BOOST_PP_LIST_FIRST_N
 BOOST_PP_LIST_FOLD_LEFT
+BOOST_PP_LIST_FOLD_LEFT_2ND
 BOOST_PP_LIST_FOLD_RIGHT
+BOOST_PP_LIST_FOLD_RIGHT_2ND
 BOOST_PP_LIST_FOR_EACH
 BOOST_PP_LIST_FOR_EACH_PRODUCT
 BOOST_PP_LIST_IS_CONS