diff --git a/cpdfcommand.ml b/cpdfcommand.ml
index 1e6c305..d5e88ce 100644
--- a/cpdfcommand.ml
+++ b/cpdfcommand.ml
@@ -2974,7 +2974,7 @@ let specs =
    ("-extract-stream", Arg.String setextractstream, " Extract a stream");
    ("-extract-stream-decompress", Arg.String setextractstreamdecomp, " Extract a stream, decompressing");
    ("-obj", Arg.String setprintobj, " Print object");
-   ("-obj-json", Arg.String setprintobjjson, " Print object");
+   ("-obj-json", Arg.String setprintobjjson, " Print object in JSON format");
    ("-replace-obj", Arg.String setreplaceobj, "Replace object");
    ("-json", Arg.Unit (fun () -> args.format_json <- true), " Format output as JSON");
    ("-verify", Arg.String (fun s -> setop (Verify s) ()), " Verify conformance to a standard");
diff --git a/cpdfmanual.pdf b/cpdfmanual.pdf
index d8d5f0f..314eb5d 100644
Binary files a/cpdfmanual.pdf and b/cpdfmanual.pdf differ
diff --git a/cpdfmanual.tex b/cpdfmanual.tex
index 6ed2af0..90b7da5 100644
--- a/cpdfmanual.tex
+++ b/cpdfmanual.tex
@@ -5744,7 +5744,7 @@ Cpdf can add PDF/UA structure data when drawing on new PDF/UA files. For example
   \noindent\verb!cpdf -remove-clipping [<range>] in.pdf -o out.pdf!
 
   \vspace{1.5mm}
-  \noindent\verb!cpdf -obj <object specification> in.pdf!
+  \noindent\verb!cpdf -obj[-json] <object specification> in.pdf!
 
   \vspace{1.5mm}
   \noindent\verb!cpdf -replace-obj <object specification>=<object> in.pdf!
@@ -5976,7 +5976,9 @@ $ ./cpdf -obj /Root/Pages/Count cpdfmanual.pdf
 "/MCBERL+URWPalladioL-Roma"
 \end{verbatim}}
 
-\noindent A stream may be extracted with \texttt{-extract-stream} or \texttt{-extract-stream-decompress}, which decompresses it first where possible:
+\noindent To output data in JSON format instead of PDF format, use \texttt{-obj-json} in place of \texttt{-obj}.
+
+A stream may be extracted with \texttt{-extract-stream} or \texttt{-extract-stream-decompress}, which decompresses it first where possible:
 
 {\small\begin{verbatim}
 $ cpdf -obj 0 hello.pdf
@@ -6000,13 +6002,21 @@ $ cpdf -extract-stream-decompress 2 hello.pdf -stdout
 
 \noindent By these mechanisms, ad-hoc exploration of PDF files is possible.
 
-We may also edit dictionary entries with \texttt{-replace-obj} by giving an object specification, and the new value in JSON format:
+We may also edit dictionary entries with \texttt{-replace-obj} by giving an object specification, and the new value in JSON or PDF format (prefix with "PDF" to denote PDF format):
 
   \begin{framed}
   \small\noindent\verb!cpdf -replace-obj /Root/MarkInfo/Marked=true in.pdf -o out.pdf!
 
   \vspace{2.5mm}
   \noindent Replace or add dictionary entry in \texttt{in.pdf}, writing to \texttt{out.pdf}. 
+
+  \vspace{2.5mm}
+
+  \small\noindent\verb!cpdf -replace-obj '/Root/Info/Title=PDF(New title)' in.pdf -o out.pdf!
+
+  \vspace{2.5mm}
+  \noindent Replace or add dictionary entry in \texttt{in.pdf}, writing to \texttt{out.pdf}. 
+
   \end{framed}
 
 \noindent Any part of the object specification not already present will be fabricated using direct nested dictionaries. For example, if \texttt{/MarkInfo} does not exist in the root dictionary, this command adds \texttt{/MarkInfo <</Marked true>>} to the root dictionary.