Tell what the result objects are (based on comment from the list).
diff --git a/Doc/lib/libpopen2.tex b/Doc/lib/libpopen2.tex
index 71c4631..e484d23 100644
--- a/Doc/lib/libpopen2.tex
+++ b/Doc/lib/libpopen2.tex
@@ -18,14 +18,15 @@
\begin{funcdesc}{popen2}{cmd\optional{, bufsize}}
Executes \var{cmd} as a sub-process. If \var{bufsize} is specified,
-it specifies the buffer size for the I/O pipes. Returns
-\code{(\var{child_stdout}, \var{child_stdin})}.
+it specifies the buffer size for the I/O pipes. Returns the file
+objects \code{(\var{child_stdout}, \var{child_stdin})}.
\end{funcdesc}
\begin{funcdesc}{popen3}{cmd\optional{, bufsize}}
Executes \var{cmd} as a sub-process. If \var{bufsize} is specified,
-it specifies the buffer size for the I/O pipes. Returns
-\code{(\var{child_stdout}, \var{child_stdin}, \var{child_stderr})}.
+it specifies the buffer size for the I/O pipes. Returns the file
+objects \code{(\var{child_stdout}, \var{child_stdin},
+\var{child_stderr})}.
\end{funcdesc}
The class defining the objects returned by the factory functions is