# I want to display the origin on the graph.

I'm displaying the graph of a function as follows:

```
d = 2
n = 1
psi(x) = sqrt(2.0/d)*sin(n*pi*x/d)
graph = plot(abs(psi(x))^2, 0, d, figsize=5, axes_labels=['$x$', '$|\psi_{1}(x)|^2$'])
graph.show()
```

I want to display "o" at the origin. Is there no choice but to display it in text as shown below?

text('o', (-1, -1))