diff --git a/cpdfcommand.ml b/cpdfcommand.ml
index 4f6cd06..bf8f20d 100644
--- a/cpdfcommand.ml
+++ b/cpdfcommand.ml
@@ -594,7 +594,7 @@ let args =
    boxes = false;
    encrypt_metadata = true;
    retain_numbering = false;
-   process_struct_trees = true;
+   process_struct_trees = false;
    remove_duplicate_fonts = false;
    remove_duplicate_streams = false;
    encoding = Cpdfmetadata.Stripped;
@@ -733,7 +733,7 @@ let reset_arguments () =
   args.boxes <- false;
   args.encrypt_metadata <- true;
   args.retain_numbering <- false;
-  args.process_struct_trees <- true;
+  args.process_struct_trees <- false;
   args.remove_duplicate_fonts <- false;
   args.remove_duplicate_streams <- false;
   args.encoding <- Cpdfmetadata.Stripped;
@@ -1975,9 +1975,9 @@ and specs =
    ("-merge-add-bookmarks-use-titles",
        Arg.Unit setmergeaddbookmarksusetitles,
        " Use title of document rather than filename");
-   ("-no-process-struct-trees",
-       Arg.Unit (fun () -> args.process_struct_trees <- false),
-       " Do not process structure trees");
+   ("-process-struct-trees",
+       Arg.Unit (fun () -> args.process_struct_trees <- true),
+       " Process structure trees");
    ("-remove-duplicate-fonts",
        Arg.Unit set_remove_duplicate_fonts,
        " Remove duplicate fonts when merging");
diff --git a/cpdfmanual.pdf b/cpdfmanual.pdf
index 223bbc9..c99fc1a 100644
Binary files a/cpdfmanual.pdf and b/cpdfmanual.pdf differ
diff --git a/cpdfmanual.tex b/cpdfmanual.tex
index 74e55fa..2299a33 100644
--- a/cpdfmanual.tex
+++ b/cpdfmanual.tex
@@ -1206,20 +1206,22 @@ In modern usage, \texttt{-utf8} is almost always the sensible option. But for hi
 cpdf -merge in1.pdf [<range>] in2.pdf [<range>] [<more names/ranges>]
      [-collate] [-retain-numbering] [-remove-duplicate-fonts]
      [-merge-add-bookmarks [-merge-add-bookmarks-use-titles]]
-     [-no-process-struct-trees]
+     [-process-struct-trees]
      -o out.pdf\end{verbatim}
 
   \vspace{1.5mm}
-  \noindent\verb!cpdf -split in.pdf -o <format> [-chunk <chunksize>]!
+  \noindent\verb!cpdf -split in.pdf [-chunk <chunksize>] [-process-struct-trees]!\\
+  \noindent\verb!     -o <format>!
 
   \vspace{1.5mm}
-  \noindent\verb!cpdf -split-bookmarks <level> in.pdf [-utf8] -o <format>!
+  \noindent\verb!cpdf -split-bookmarks <level> in.pdf [-utf8] [-process-struct-trees]!\\
+  \noindent\verb!     -o <format>!
 
   \vspace{1.5mm}
-  \noindent\verb!cpdf -split-max <file size> in.pdf -o <format>!
+  \noindent\verb!cpdf -split-max <file size> in.pdf [-process-struct-trees] -o <format>!
 
   \vspace{1.5mm}
-  \noindent\verb!cpdf -spray in.pdf -o a.pdf [-o b.pdf [-o ...]]!
+  \noindent\verb!cpdf -spray in.pdf [-process-struct-trees] -o a.pdf [-o b.pdf [-o ...]]!
   \end{framed}
 
   \vspace{12mm}
@@ -1259,7 +1261,7 @@ 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. The \texttt{-merge\--add\--bookmarks\--use\--titles}, when used in conjunction with \texttt{-merge-add-bookmarks}, will use the title from each PDF's metadata instead of the filename.
 
-The \texttt{-no-process-struct-tree} option prevents processing of structure trees. Instead of merging them, they are simply copied across wholesale. This can be useful with \texttt{-collate} which can presently cause an increased size. Or, to simply save time when a merged structure tree is not required. 
+The \texttt{-process-struct-trees} option will merge structure trees. Without this option, instead of merging them, they are simply copied across wholesale.
 
   \section{Splitting}
 \index{splitting}