diff --git a/Lectures/L04_ReqContinued/ReqContinued.tex b/Lectures/L04_ReqContinued/ReqContinued.tex
index 7e09d96f66cf2a60ccd17d685f1a4b1feaf22a58..a2b1c9e62d1d6a14502bfde06042fd46f27a5208 100755
--- a/Lectures/L04_ReqContinued/ReqContinued.tex
+++ b/Lectures/L04_ReqContinued/ReqContinued.tex
@@ -247,6 +247,8 @@ Also Goal Statements and Requirements
 \begin{itemize}
 \item Goal statement(s)
 \item Inputs and outputs
+\item Think about the types of your inputs and outputs (not everything is a real
+  number)
 \end{itemize}
 
 \end{frame}