The indefinite article in the phrase "children who have a reading disability

[Fedorov]

Is it OK to use the indefinite article in the phrase "children who have a reading disability"?
This was taken from the Remedial Reading Drills.
_________________
Help me to improve my English, please. You'll get better company then ;-)

[James]

I would think it's fine.

[Cerberus™]

Yes it is fine. It implies that there could be several kinds of reading disability, which in fact there are.

[Fedorov]

OK, thanks.
_________________
Help me to improve my English, please. You'll get better company then ;-)