Go to
https://en.wikipedia.org/w/api.php
and search for "dir " (with the space). There will be 43 results. Of these, only a few (9 results) have an explanation of the meaning of "newer" and "older", like this:
```
rvdir - In which direction to enumerate (enum)
newer - List oldest first. Note: rvstart has to be before rvend.
older - List newest first (default). Note: rvstart has to be later than rvend.
One value: newer, older
Default: older
```
The others are documented like so:
```
afldir - The direction in which to enumerate
One value: newer, older
Default: older
```
This could be improved to match the first example above.
It seems includes/api/ApiQueryBase.php has a function getDirectionDescription to help with this.
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**Version**: 1.23.0
**Severity**: enhancement