Eli Zaretskii <eliz@gnu.org> writes:
>> --- a/etc/NEWS
>> +++ b/etc/NEWS
>> @@ -111,6 +111,10 @@ If you have been using these variables in Lisp code (for example, in
>>  font-lock rules), simply quote the symbol, to use the face directly
>>  instead of its now-obsolete variable.

>> +** New minor mode 'electric-block-comment-mode'
>> +This mode automatically close block comment typed, thus typing
>> +"/*" in c-mode automatically inserts "*/".
>> +

> This should mention block-comment-start and block-comment-end.  Also,
> it would be good to name a few modes which support block comments,
> just so users of those modes will become interested.

I agree, done.

Sending fixed patch.