Update README.md

[postgresql/pgbench_looper] / README.md

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@@ -8,6 +8,8 @@ plotted as required. Gnuplot script and excel sheet included to graph output.
 Usage
 -----
 
+Edit the variables at the top of the script to suit, then run.
+
 $ ./pgbench_looper.sh
 
 Graphing output