Note about structure trees

cpdfmanual.tex

@@ -1364,6 +1364,11 @@ Spraying is a sort of de-collation. It takes one input file, and writes pages in
 \section{Encrypting with Split operations}
 \index{encryption}
 The encryption parameters described in Chapter \ref{encryption} may be added to the command line to encrypt each split PDF. Similarly, the \texttt{-recrypt} switch described in Chapter \ref{basicusage} may by given to re-encrypt each file with the existing encryption of the source PDF.
+
+\section{Splitting and structure trees}
+
+Presently, cpdf will include the input structure tree in each output PDF. To remove a structure tree entirely, preprocess the file with \texttt{-remove-dict-entry /StructTreeRoot}. If you do not require structure trees, this will lead to faster splitting, and smaller outputs.
+
 \pagestyle{empty}\thispagestyle{fancy}
 
 \begin{cpdflib}