--- a/handouts/amm-faq.tex	Fri Nov 14 10:22:09 2025 +0000
+++ b/handouts/amm-faq.tex	Fri Nov 14 12:38:59 2025 +0000
@@ -124,6 +124,19 @@
 I usually delete all files inside this directory and in this way force 
 ammonite to be in a consistent state.
 
+\subsection*{Warnings in CW2 (A)}
+
+If you introduce new values for example for the \texttt{NTIMES} and \texttt{PLUS} regular expressions, then do \emph{not} call the values \texttt{Ntimes}, \texttt{Plus}. Rather call them \texttt{Pls} and \texttt{Ntms}. This avoids problems for filesystems that do not distinguish between uppercase and lowercase letters.
+
+\subsection*{Warnings in CW2 (B)}
+
+If you get a warning about \texttt{\$} being not defined infix, then define the
+extension method with
+
+\begin{center}
+\texttt{infix def \$ (r: Rexp) = RECD(s, r)} %$
+\end{center}
+
 \end{document}
 
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