@@ -34,16 +34,23 @@ Low level interface to =gnuplot= that provides:
 * Cygwin and =wgnuplot=
   For use of Cygwin and =wgnuplot=, one needs to provide the feature
   =:wgnuplot=.  Furthermore, one needs to specify the path to the
-  executable.  This is done via =:wgnuplot='s property list:
+  ~gnuplot.exe~ console executable.  This is done via =:wgnuplot='s
+  property list:
 #+BEGIN_SRC lisp
 (setf (symbol-plist :wgnuplot)
    (list :executable "posix compliant path to executable"))
 #+END_SRC
 For example, the path can be:
 #+BEGIN_QUOTE
-"/c/Program\\ Files/wgnuplot/binary/gnuplot.exe"
+"/c/Program\\ Files/wgnuplot/bin/gnuplot.exe"
 #+END_QUOTE
-The double quote of the space in the file-name is necessary. 
+
+The ~:wgnuplot~ p-list has to be set-up prior to loading
+~gnuplot-interface~.  The executable path has to be enclosed in quotes
+because of the space.  The double backslash is not sufficient.
+
+If the path is changed during a lisp session, the ~*executable*
+variable has to be set to the new path.
 
 * Caveats
 - stream plumbing is not thoroughly tested