In the footnote(2) on that page you refer to the example val onetwoThreeFour = oneTwo ::: threeFour
to introduce the right handed associativity of operators ending in a colon.
However even the most astute reader would not have spotted that from this example because you introduced the ::: operator to 'concatenate a passed list on the List on which it is invoked'. This short description does not reveal whether the passed list will be prepended or appended, thus the reader will have no problem with believing the ::: operator to be called on the left operand.
Only the following example val oneTwoThree = 1 :: twoThree
will make a reader stop to wonder! Here it is clear that twoThree could hardly be added to an Int to form a new List.
I believe that the footnote would make more sense if it's applied to the second example where :: is introduced, OR the description of ::: should be more specific.
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