diff --git a/autoload/nerdtree.vim b/autoload/nerdtree.vim
index c440bf8..3591932 100644
--- a/autoload/nerdtree.vim
+++ b/autoload/nerdtree.vim
@@ -513,7 +513,7 @@ function! nerdtree#dumpHelp()
         let @h=@h."\" ". g:NERDTreeMapHelp .": toggle help\n"
         let @h=@h."\"\n\" ----------------------------\n"
         let @h=@h."\" Bookmark commands~\n"
-        let @h=@h."\" :Bookmark <name>\n"
+        let @h=@h."\" :Bookmark [<name>]\n"
         let @h=@h."\" :BookmarkToRoot <name>\n"
         let @h=@h."\" :RevealBookmark <name>\n"
         let @h=@h."\" :OpenBookmark <name>\n"
diff --git a/doc/NERD_tree.txt b/doc/NERD_tree.txt
index 2458d11..6e83423 100644
--- a/doc/NERD_tree.txt
+++ b/doc/NERD_tree.txt
@@ -160,7 +160,7 @@ click bookmarks or use the |NERDTree-o| mapping to activate them. See also,
 
 Note that the following commands are only available in the NERD tree buffer.
 
-:Bookmark <name>
+:Bookmark [<name>]
     Bookmark the current node as <name>. If there is already a <name>
     bookmark, it is overwritten. <name> must not contain spaces.
     If <name> is not provided, it defaults to the file or directory name.