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README.md

@@ -37,7 +37,7 @@ import plotter
 ### Functions argument description
 Positional arguments for functions `plotter.dump, plotter.plot, plotter.ani_plot, plotter.plot_contour, plotter.avg_plot`:
 <ol>
-  <li>filename</li>
+  <li>**filename**</li>
 </ol>
 
 Optional arguments for functions `plotter.plot, plotter.ani_plot, plotter.plot_contour, plotter.avg_plot`: