ohlc documentation
The documentation for ohlc is missleading. In https://pandas.pydata.org/pandas-docs/stable/reference/groupby.html The following doc appears, which probably references the docstring in the code.
![image](https://user-images.githubusercontent.com/30231949/74328919-b3758000-4d86-11ea-96c1-9205373a48ad.png)

A sentence like `Computes open, high, low and close values, excluding missing values` is probably more complete.