Since the '--tidy' option has only been introduced in Texinfo
4.9
More ordinary English syntax would be:
Since the '--tidy' option was introduced in Texinfo 4.9
(Though the meaning is clear in the original.)
The users should be warned about the planned behavioural change
I have the impression that Automake (mostly) uses American English,
rather than British English. Since that's where it was created, after
all. Hence, I suggest: behavioral.
The actual change seems fine to me, FWIW.
karl
