Help with +.t

Hey! Can anyone help me with what .t means and where to find it (and other things like it) in the Help? I came across it in the Help for SynthDef:

SynthDef(\arrayarg, {
    ...
    sines = SinOsc.ar(freqs +.t [0,0.5]).cubed.sum; // A mix of 4 oscillators
    ...
});

It appears to be modifying the + operator:

[439, 441] + [0.0, 0.5]; // evaluates to  -> [ 439.0, 441.5 ]
[439, 441] +.t[0.0, 0.5]; // evaluates to -> [ [ 439.0, 439.5 ], [ 441.0, 441.5 ] ]

But I can’t seem to find it in the Help or in forum threads when I search for something like .t or +.t.
Thanks!

They’re called adverbs. Indeed – difficult to search.

hjh

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