diff --git a/docs/Design/SoftDetailedDes/MIS.pdf b/docs/Design/SoftDetailedDes/MIS.pdf
index d0aa0ae..7808ac5 100644
Binary files a/docs/Design/SoftDetailedDes/MIS.pdf and b/docs/Design/SoftDetailedDes/MIS.pdf differ
diff --git a/docs/Design/SoftDetailedDes/MIS.tex b/docs/Design/SoftDetailedDes/MIS.tex
index 31c2d9f..fc54b25 100644
--- a/docs/Design/SoftDetailedDes/MIS.tex
+++ b/docs/Design/SoftDetailedDes/MIS.tex
@@ -108,6 +108,7 @@ \section{Notation}
 matrix & $\mathbb{R}^{m \times n}$ & matrix of any number in (-$\infty$, $\infty$)\\
 vector & $\mathbb{R}^{m}$ & column vector of any number in (-$\infty$, $\infty$)\\
 quaternion & $\mathbb{H}^4$ & a quaternion $\in \mathbb{R}^4$, see SRS for details\\
+string & stringT & a sequence of characters \\
 \bottomrule
 \end{tabular}
 \end{center}
@@ -381,7 +382,7 @@ \subsubsection{Exported Access Programs}
 \hline
 \textbf{Name} & \textbf{In} & \textbf{Out} & \textbf{Exceptions} \\
 \hline
-error\_handler & string & - & string \\
+error\_handler & stringT & - & stringT \\
 \hline
 \end{tabular}
 \end{center}
@@ -395,6 +396,8 @@ \subsubsection{Access Routine Semantics}
 \item exception: Exception := exception
 \end{itemize}
 
+This function creates an exception based on the string passed to it.
+
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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \newpage