diff --git a/lib/nerdtree/ui.vim b/lib/nerdtree/ui.vim
index 03f11b8..6ee8dab 100644
--- a/lib/nerdtree/ui.vim
+++ b/lib/nerdtree/ui.vim
@@ -47,6 +47,8 @@ function! s:UI._dumpHelp()
         let help .= "\" ". (g:NERDTreeMouseMode ==# 1 ? "double" : "single") ."-click,\n"
         let help .= "\" ". g:NERDTreeMapActivateNode .": open & close node\n"
         let help .= "\" ". g:NERDTreeMapOpenRecursively .": recursively open node\n"
+        let help .= "\" ". g:NERDTreeMapOpenInTab.": open in new tab\n"
+        let help .= "\" ". g:NERDTreeMapOpenInTabSilent .": open in new tab silently\n"
         let help .= "\" ". g:NERDTreeMapCloseDir .": close parent of node\n"
         let help .= "\" ". g:NERDTreeMapCloseChildren .": close all child nodes of\n"
         let help .= "\"    current node recursively\n"