How to stack numpy array along an axis

I have two numpy arrays, one with shape let's say (10, 5, 200), and another one with the shape (1, 200), how can I stack them so I get as a result an array of dimensions (10, 6, 200)? Basically by stacking it to each 2-d array iterating along the first dimension

a = np.random.random((10, 5, 200))
b = np.zeros((1, 200))

I'v tried with hstack and vstack but I get an error in incorrect number of axis

source https://stackoverflow.com/questions/72777319/how-to-stack-numpy-array-along-an-axis

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