# Comment an equation without creating extra space

I try to make a comment on the right (or left) of one line of proof. But the align* environment automatically move the whole equations to the left to leave space for the comment. But I still want the equations to be in the center (the comment is short enough that it won't be conflicting the equations). How could I achieve this?

To be more specific, I used the code

\begin{align*}
equation0 &= equation1
&= equation2
&= equation3 && \text{make a comment here}
&= equation4
\end{align*}

I just want to put \text{make a comment here} on the right without affecting the original alignment of the equations.

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