# Enumerate list with side notes

I would like to do something similar to this:

Where the property and its name are in the same line (like for symmetry property) and between round brackets like here. How can I do it?

• They're not all on the same line! – Bernard Oct 27 '16 at 8:49
• Ok, supposing that there is enough space for doing so. – user6321 Oct 27 '16 at 8:50

It is possible to make the descriptions flush right by adding \hfill before, like this

\begin{enumerate}
\item $d(O_x,O_y) = d(O_y,O_x)$ \hfill (symmetry)
\end{enumerate}


With help of a new command:

\newcommand*{\itemtag}[1]{\hfill (\emph{#1})}
\begin{enumerate}
\item $d(O_x,O_y) = d(O_y,O_x)$ \itemtag{symmetry}
\end{enumerate}

• unfortunately, this doesn't work if the \itemtag doesn't fit on the same line. – barbara beeton Oct 28 '16 at 14:12