add explanatory text.

tanghaibao · Jun 24, 2018 · c740915 · c740915
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commit c740915
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diff --git a/doc/md/README_plot_go.md b/doc/md/README_plot_go.md
@@ -36,6 +36,7 @@ scripts/go_plot.py --go_file=tests/data/go_plot/go_heartjogging6.txt -o heartjog
 ![heart_jogging_r0](../images/plot_go/heartjogging6_r0.png)
 
 ### Six different-colored GO terms with relationships
+The **-r** argument causes relationships to be plotted.    
 ```
 scripts/go_plot.py --go_file=tests/data/go_plot/go_heartjogging6.txt -r -o heartjogging6_r1.png
 ```