diff --git a/cpdfcommand.ml b/cpdfcommand.ml
index ba98cf1..b4ae63e 100644
--- a/cpdfcommand.ml
+++ b/cpdfcommand.ml
@@ -192,6 +192,7 @@ type op =
   | ExtractText
   | OpenAtPage of string
   | OpenAtPageFit of string
+  | OpenAtPageCustom of string
   | AddPageLabels
   | RemovePageLabels
   | PrintPageLabels
@@ -319,6 +320,7 @@ let string_of_op = function
   | ExtractText -> "ExtractText"
   | OpenAtPage _ -> "OpenAtPage"
   | OpenAtPageFit _ -> "OpenAtPageFit"
+  | OpenAtPageCustom _ -> "OpenAtPageCustom"
   | AddPageLabels -> "AddPageLabels"
   | RemovePageLabels -> "RemovePageLabels"
   | PrintPageLabels -> "PrintPageLabels"
@@ -822,7 +824,7 @@ let banned banlist = function
   | DumpAttachedFiles | RemoveMetadata | EmbedMissingFonts | BookmarksOpenToLevel _ | CreatePDF
   | SetPageMode _ | SetNonFullScreenPageMode _ | HideToolbar _ | HideMenubar _ | HideWindowUI _
   | FitWindow _ | CenterWindow _ | DisplayDocTitle _
-  | RemoveId | OpenAtPageFit _ | OpenAtPage _ | SetPageLayout _
+  | RemoveId | OpenAtPageFit _ | OpenAtPage _ | OpenAtPageCustom _ | SetPageLayout _
   | ShowBoxes | TrimMarks | CreateMetadata | SetMetadataDate _ | SetVersion _
   | SetAuthor _|SetTitle _|SetSubject _|SetKeywords _|SetCreate _
   | SetModify _|SetCreator _|SetProducer _|RemoveDictEntry _ | ReplaceDictEntry _ | PrintDictEntry _ | SetMetadata _
@@ -1566,6 +1568,10 @@ let setopenatpagefit n =
   detect_duplicate_op (OpenAtPageFit n);
   args.op <- Some (OpenAtPageFit n)
 
+let setopenatpagecustom n =
+  detect_duplicate_op (OpenAtPageCustom n);
+  args.op <- Some (OpenAtPageCustom n)
+
 let setlabelstyle s =
   let style =
     match s with
@@ -2564,6 +2570,9 @@ and specs =
    ("-open-at-page-fit",
       Arg.String setopenatpagefit,
       " Set inital page, scaling to fit");
+   ("-open-at-page-custom",
+      Arg.String setopenatpagecustom,
+      " Set inital page, with custom scaling");
    ("-set-metadata",
       Arg.String setmetadata,
       " Set metadata to the contents of a file");
@@ -3822,8 +3831,11 @@ let go () =
   | Some (OpenAtPageFit str) ->
       let pdf = get_single_pdf args.op false in
       let range = parse_pagespec_allow_empty pdf str in
-      let n = match range with [x] -> x | _ -> error "open_at_page: range does not specify single page" in
+      let n = match range with [x] -> x | _ -> error "open_at_page_fit: range does not specify single page" in
         write_pdf false (Cpdfmetadata.set_open_action pdf true n)
+  | Some (OpenAtPageCustom dest) ->
+      let pdf = get_single_pdf args.op false in
+        write_pdf false (Cpdfmetadata.set_open_action ~dest pdf true 1)
   | Some (SetMetadata metadata_file) ->
       write_pdf false (Cpdfmetadata.set_metadata args.keepversion metadata_file (get_single_pdf args.op false))
   | Some (SetVersion v) ->
diff --git a/cpdfmanual.tex b/cpdfmanual.tex
index 86e7615..ed97bd6 100644
--- a/cpdfmanual.tex
+++ b/cpdfmanual.tex
@@ -12,6 +12,7 @@
 %Document Topleft2 etc.
 %Test new camlpdf unit conversions
 %Document -non-full-screen-page-mode
+%Documnet -open-at-page-custom
 \documentclass{book}
 % Edit here to produce cpdfmanual.pdf, cpdflibmanual.pdf, pycpdfmanual.pdf,
 % dotnetcpdflibmanual.pdf, jcpdflibmanual.pdf jscpdflibmanual.pdf etc.
diff --git a/cpdfmetadata.ml b/cpdfmetadata.ml
index 564b679..030dae2 100644
--- a/cpdfmetadata.ml
+++ b/cpdfmetadata.ml
@@ -682,16 +682,30 @@ let set_non_full_screen_page_mode pdf s =
   | _ -> error "Unknown non full screen page mode"
 
 (* Set open action *)
-let set_open_action pdf fit pagenumber =
+let set_open_action pdf ?dest fit pagenumber =
   if pagenumber > Pdfpage.endpage pdf || pagenumber < 0 then
     raise (error "set_open_action: invalid page number")
   else
     let pageobjectnumber = select pagenumber (Pdf.page_reference_numbers pdf) in
       let destination =
-        if fit then
-          Pdf.Array [Pdf.Indirect pageobjectnumber; Pdf.Name "/Fit"]
-        else
-          Pdf.Array [Pdf.Indirect pageobjectnumber; Pdf.Name "/XYZ"; Pdf.Null; Pdf.Null; Pdf.Null]
+        match dest with
+        | Some s ->
+            begin match Pdfread.parse_single_object s with
+            | Pdf.Array (Pdf.Integer pagenum::more) ->
+                begin try
+                  let pageobjectnumber = select pagenum (Pdf.page_reference_numbers pdf) in
+                    Pdf.Array (Pdf.Indirect pageobjectnumber::more)
+                with
+                  _ -> raise (Pdf.PDFError "bad page number in custom destination")
+                end
+            | _ | exception _ ->
+              raise (Pdf.PDFError "Bad destination syntax")
+            end
+        | None ->
+            if fit then
+              Pdf.Array [Pdf.Indirect pageobjectnumber; Pdf.Name "/Fit"]
+            else
+              Pdf.Array [Pdf.Indirect pageobjectnumber; Pdf.Name "/XYZ"; Pdf.Null; Pdf.Null; Pdf.Null]
       in
         let open_action =
           Pdf.Dictionary [("/D", destination); ("/S", Pdf.Name "/GoTo")]
diff --git a/cpdfmetadata.mli b/cpdfmetadata.mli
index cb778bf..8084a30 100644
--- a/cpdfmetadata.mli
+++ b/cpdfmetadata.mli
@@ -39,7 +39,7 @@ val set_page_mode : Pdf.t -> string -> Pdf.t
 val set_non_full_screen_page_mode : Pdf.t -> string -> Pdf.t
 
 (** Set the open action. If the boolean is true, /Fit will be used, otherwise /XYZ *)
-val set_open_action : Pdf.t -> bool -> int -> Pdf.t
+val set_open_action : Pdf.t -> ?dest:string -> bool -> int -> Pdf.t
 
 (** Set the PDF version number *)
 val set_version : int -> Pdf.t -> unit