The settings on this tab pertain to all of the supported switches.
I see the above sentence from Avaya document,
and found the definition of "pertain" from pertain: Definition, Synonyms from Answers.com,
- To have reference; relate: evidence that pertains to the accident.
According to the Answers' example sentence, and according to the rule of 3rd singular, I think that "pertain" in Avaya sentence should be change to "pertains".
The settings on this tab pertains to all of the supported switches.
Which is correct? and why?