# In-line comments in align? [duplicate]

Is there a way to insert comments at the end of a line, within a block of TeX? For example, something like the following

\begin{align} &(B \cap A) = (C \cap A) \\ 'given &(B \cap A) \cup (B \cap \overline{A}) = (C \cap A) \cup (C \cap \overline{A}) \\ 'substitution and distributive law \end{align}
&B = C


where ' would indicate a comment. It would be handy for justifying certain steps when writing proofs.