Thread:User talk:Rua/Further reading header - L3 or L4/reply

I searched the source and found the following:
 * 1) 403 entries (0.24%) with "Further reading" at L5.
 * 18,425 entries (10.82%) with "Further reading" at L4.
 * 1) 151,430 entries (88.94%) with "Further reading" at L3.

Please comment if you think that the header level should be L4 by default, or if your revert is a mistake.