Step response is not showing up in the legend of my plot

I am trying to plot both the experimental and simulated (step function of a first order transfer function) data. Both of the data sets are being displayed on the same graph, but when I try to put a legend on the plot it only says the step function is "untitled 1"

Answer 1

[Sam Chak]

I tried plotting both to display on the same graph and inserted the legends. There's no problems so far.

legend('simulated', 'experimental', 'location', 'east')