diff --git a/doc/NERD_tree.txt b/doc/NERD_tree.txt
index ede4590..0cf6899 100644
--- a/doc/NERD_tree.txt
+++ b/doc/NERD_tree.txt
@@ -122,7 +122,8 @@ For example, you could use bookmarks to tag all of your project directories.
 
 If the bookmark table is active (see |NERDTree-B| and
 |NERDTreeShowBookmarks|), it will be rendered above the tree. You can double
-click bookmarks or use the |NERDTree-o| mapping to activate them.
+click bookmarks or use the |NERDTree-o| mapping to activate them. See also,
+|NERDTree-t| and |NERDTree-T|
 
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 2.2.2. Bookmark commands                            *NERDTreeBookmarkCommands*