All right.  I'll fix it up.

On Wed, 13 Feb 2013, Aaron Meurer wrote:

>> @@ -21,7 +21,9 @@ def _free_symbols(function, limits):
>>
>>
>>  class Sum(Expr):
>> -    """Represents unevaluated summation."""
>> +    """Represents unevaluated summation.
>> +
>
> I didn't mean to delete what you had. I just meant that the first sentence of the docstring should always be separated from the rest by a blank line.
>
> Really, this docstring should have more explanation, and some examples.
>
> ---
> Reply to this email directly or view it on GitHub:
> https://github.com/sympy/sympy/pull/1781/files#r3003423
>