Sure, here are some examples of good and bad documentation:

Good documentation:

```python 
def add(a, b):
    """
    Adds two numbers together and returns the result.

    :param a: the first number to add
    :param b: the second number to add
    :return: the sum of a and b
    """
    return a + b
```

Bad documentation:

```python 
def add(a, b):
    # This function adds two numbers
    return a + b
```

In the first example, the docstring provides clear and concise information about the purpose of the function, the parameters it takes, and what it returns. This makes it easy for someone to understand how to use the function without having to read through the code.

In the second example, the comment provides some information about the function, but it is not as clear or as complete as the docstring. It also does not follow a consistent format, which can make it harder to read and understand.
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