Replace node ID with a label

I have tried out a very simple graph, with dotty.
which is as follows, I would like to know how to display some text content in these nodes in addition to the node id?

I'm trying to build s simple code flow chart from some code., so it can contain text like "a = a+1;", "print('Hello')" ; etc..

digraph G {
start -> a0;
start -> b0;
a1 -> b3;
b2 -> a3;
a3 -> a0;
a3 -> end;
b3 -> end;
start [shape=Mdiamond];
end [shape=Msquare];

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