added more on visualization

docs/basics.rst

@@ -109,11 +109,16 @@ If a workflow has been added without check it can be check later with::
 Visualize workflows
 -------------------
 
-Already added workflows can be converted into DOT format and viewed graphically
-as PDF::
+Already added workflows can be converted into DOT format and viewed graphically::
 
     lpad check_wflow -i <firework ID> [--view_control_flow] [--view_data_flow] [-f <DOT_FILE>]
 
+After the dot file is produced it can be converted to PDF and the workflow graph 
+can be viewed::
+
+    dot -Tpdf -o workflow.pdf workflow.dot
+    evince workflow.pdf
+
 
 .. _execution: