diff --git a/cpdfcommand.ml b/cpdfcommand.ml
index 5cbee32..ab7ad1e 100644
--- a/cpdfcommand.ml
+++ b/cpdfcommand.ml
@@ -423,6 +423,7 @@ type args =
    mutable alsosetxml : bool;
    mutable justsetxml : bool;
    mutable gs_malformed : bool;
+   mutable gs_quiet : bool;
    mutable merge_add_bookmarks : bool;
    mutable merge_add_bookmarks_use_titles : bool;
    mutable createpdf_pages : int;
@@ -517,6 +518,7 @@ let args =
    alsosetxml = false;
    justsetxml = false;
    gs_malformed = false;
+   gs_quiet = false;
    merge_add_bookmarks = false;
    merge_add_bookmarks_use_titles = false;
    createpdf_pages = 1;
@@ -608,7 +610,7 @@ let reset_arguments () =
   args.removeonly <- None
   (* Do not reset original_filename or cpdflin or was_encrypted or
    * was_decrypted_with_owner or recrypt or producer or creator or
-   * path_to_ghostscript or gs_malformed, since we want these to work across
+   * path_to_ghostscript or gs_malformed or gs_quiet, since we want these to work across
    * ANDs. Or squeeze: a little odd, but we want it to happen on eventual output. *)
 
 let get_pagespec () =
@@ -1672,6 +1674,9 @@ let setcreatepdfpapersize s =
 let setdraftremoveonly s =
   args.removeonly <- Some s
 
+let setgsquiet () =
+  args.gs_quiet <- true
+
 (* Parse a control file, make an argv, and then make Arg parse it. *)
 let rec make_control_argv_and_parse filename =
   control_args := !control_args @ parse_control_file filename
@@ -2282,7 +2287,8 @@ and specs =
     Arg.String setcreatepdfpapersize,
     " Paper size for new PDF"); 
    ("-gs", Arg.String setgspath, " Path to gs executable");
-   ("-gs-malformed", Arg.Unit setgsmalformed, " Try to reconstruct malformed files with gs");
+   ("-gs-malformed", Arg.Unit setgsmalformed, " Also try to reconstruct malformed files with gs");
+   ("-gs-quiet", Arg.Unit setgsquiet, " Make gs go into quiet mode");
    ("-squeeze", Arg.Unit setsqueeze, " Squeeze");
    ("-squeeze-log-to", Arg.String setsqueezelogto, " Squeeze log location");
    (*These items are undocumented *)
@@ -2336,7 +2342,7 @@ let embed_missing_fonts fi fo =
   end;
     let gscall =
       args.path_to_ghostscript ^
-      " -dNOPAUSE -dQUIET -sDEVICE=pdfwrite -sOUTPUTFILE=" ^ fo ^
+      " -dNOPAUSE " ^ (if args.gs_quiet then "-dQUIET" else "") ^ " -sDEVICE=pdfwrite -sOUTPUTFILE=" ^ fo ^
       " -dBATCH " ^ fi
     in
       match Sys.command gscall with
@@ -2355,7 +2361,7 @@ let mend_pdf_file_with_ghostscript filename =
     tempfiles := tmpout::!tempfiles;
     let gscall =
       args.path_to_ghostscript ^
-      " -dNOPAUSE -dQUIET -sDEVICE=pdfwrite -sOUTPUTFILE=" ^ tmpout ^
+      " -dNOPAUSE " ^ (if args.gs_quiet then "-dQUIET" else "") ^ " -sDEVICE=pdfwrite -sOUTPUTFILE=" ^ tmpout ^
       " -dBATCH " ^ filename
     in
       match Sys.command gscall with
@@ -4622,7 +4628,7 @@ let gs_malformed_force fi fo =
   end;
     let gscall =
       args.path_to_ghostscript ^
-      " -dNOPAUSE -dQUIET -sDEVICE=pdfwrite -sOUTPUTFILE=" ^ fo ^
+      " -dNOPAUSE " ^ (if args.gs_quiet then "-dQUIET" else "") ^ " -sDEVICE=pdfwrite -sOUTPUTFILE=" ^ fo ^
       " -dBATCH " ^ fi
     in
       match Sys.command gscall with
diff --git a/cpdfmanual.pdf b/cpdfmanual.pdf
index 24e0c45..0f48897 100644
Binary files a/cpdfmanual.pdf and b/cpdfmanual.pdf differ
diff --git a/cpdfmanual.tex b/cpdfmanual.tex
index b070c28..be6f17f 100644
--- a/cpdfmanual.tex
+++ b/cpdfmanual.tex
@@ -563,7 +563,9 @@ The standard paper sizes are listed in Section \ref{papersizes}, or you may spec
   \small
   \noindent\begin{verbatim}
 cpdf -merge in1.pdf [<range>] in2.pdf [<range>] [<more names/ranges>]
-     [-retain-numbering] [-remove-duplicate-fonts] -o out.pdf\end{verbatim}
+     [-retain-numbering] [-remove-duplicate-fonts]
+     [-merge-add-bookmarks] [-merge-add-bookmarks-use-title] 
+     -o out.pdf\end{verbatim}
 
   \vspace{1.5mm}
   \noindent\verb!cpdf -split in.pdf -o <format> [-chunk <chunksize>]!
@@ -597,9 +599,11 @@ the document which first exhibits that feature.
 The \texttt{-retain-numbering} option keeps the PDF page numbering labels of
 each document intact, rather than renumbering the output pages from 1.
 
-The \texttt{-remove-duplicate-fonts} ensures that fonts used in more than one
+The \texttt{-remove-duplicate-fonts} option ensures that fonts used in more than one
 of the inputs only appear once in the output.
 
+The \texttt{-merge-add-bookmarks} option adds a top-level bookmark for each file, using the filename. Any existing bookmarks are retained. Adding \texttt{-merge-add-bookmarks-use-titles} will use the title from each PDF's metadata instead of the filename.
+
   \section{Splitting}
 \index{splitting}
    The \texttt{-split} operation splits a PDF file into a number of parts which
@@ -1128,6 +1132,10 @@ The \texttt{-squeeze-log-to <filename>} option writes the log to the given file
   \vspace{1.5mm}
   \small\noindent\verb!cpdf -add-bookmarks <bookmark file> in.pdf -o out.pdf!
 
+  \vspace{1.5mm}
+  \small\noindent\verb!cpdf -bookmarks-open-to-level <n> in.pdf -o out.pdf!
+
+
   \end{framed}
 \index{bookmarks}
 \index{document outline}
@@ -1188,6 +1196,18 @@ will be given if the bookmarks file is not in the correct form (in particular,
 the numbers in the first column which specify the level must form a proper
 tree with no entry being more than one greater than the last).
 
+\section{Opening bookmarks}
+
+As an alternative to extracting a bookmark file and manipulating the open-status of bookmarks, mass manipulation may be achieved by the following option.
+
+  \begin{framed}
+   \small\verb!cpdf -open-bookmarks-to-level <level> in.pdf -o out.pdf!
+  \end{framed}
+
+A level of 0 will close all bookmarks, level 1 will open just the top level, closing all others etc. To open all of them, pick a sufficiently large level.
+
+
+
 \chapter{Presentations}
   \begin{framed}
   \small\noindent\begin{verbatim}