Add identification instructions

main.tex

@@ -103,7 +103,7 @@ \section{Submission Guidelines}
 The submissions can have an appendix with unlimited number of pages with supplementary material and information that do not fit in the main paper.
 However, \textbf{the reviewers are not obliged to read the appendix}---thus, all your main results and points must be maid in the main paper.
 The submissions can be submitted by following the instructions on the conference website.\footnote{\url{https://nldl.org}}
-Submissions must be in pdf format (two column, font size 10) using the official NLDL template using the \verb|review| option.
+Submissions must be in pdf format (two column, font size 10) using the official NLDL template using the \verb|review| option, and must include the OpenReview ID (obtained after creating the submission) using the macro \verb|\paperID{XX}|, where \verb|XX| is the submission's number.
 All submissions will undergo double-blind peer review.
 It will be up to the authors to ensure the proper anonymization of their paper (see Section~\ref{sec:anon}).
 In summary, do not include any names or affiliations, and refer to your own past work in the third-person.
@@ -150,6 +150,9 @@ \section{Style Guidelines}
 Do not change the typeface of the template by adding other packages that change it.
 For instance, you \textbf{should not} use the packages \verb|palatino|, \verb|fourier|, \verb|bookman|, among many others.
 
+\item \textbf{Paper identification.}
+The review version of the paper (set using \verb|review| option in the document class) must include the OpenReview ID (obtained after creating the submission) using the macro \verb|\paperID{XX}|, where \verb|XX| is the submission's number.
+
 \item \textbf{Floating elements.}
 Floats in a paper allow for flexible placement of figures, tables, and other similar objects.
 When including a figure or table, use the \verb|\begin{figure}[tb]| or the \verb|\begin{table}[tb]| environments to automatically create a float.