added more hints how to use gnuplot

math/gnuplot/high-order-knot/README.md

@@ -1,12 +1,11 @@
 Use gnuplot within latex
 ========================
-First make sure that you can use gnuplot:
-* Execute "gnuplot" in your command line
- * Doesn't work: Look up where the binary is located (e.g. `C:\Programs\gnuplot\bin\gnuplot.exe`) and add it to your path (Windows + Pause -> System variables -> Path). Then try executing "gnuplot" in terminal again
-
-It is a good idea to separate gnuplot-code from LaTeX-code! (see plot.gnuplot)
-
-`-shell-escape` or `enable-write18` is NOT needed for this solution!
+*First make sure that you can use gnuplot:
+ * Execute `gnuplot` in your command line
+  * Doesn't work: Look up where the binary is located (e.g. `C:\Programs\gnuplot\bin\gnuplot.exe`) and add it to your path (Windows + Pause -> System variables -> Path). Then try executing `gnuplot` in terminal again
+* It is a good idea to separate gnuplot-code from LaTeX-code! (see plot.gnuplot)
+* `-shell-escape` or `enable-write18` is NOT needed for this solution!
+* You have to create the plot-tmp.tex file first. Use `gnuplot plot.gnuplot` to do so.
 
 GnuPlot Terminal types
 ----------------------