Added disclaimer.

Doc/KrancDoc.tex

@@ -39,7 +39,7 @@
 \newcommand{\fixme}[1]{\textcolor{red}{#1}}
 
 \title{Kranc User Guide}
-\author{Sascha Husa and Ian Hinder}
+\author{Sascha Husa, Ian Hinder, and Jonah Miller}
 
 
 \begin{document}
@@ -1166,6 +1166,12 @@ \section{Package: Thorn}
 \chapter{Reference}
 \label{ch:ref}
 
+This is a reference document for many functions available in Kranc and
+TensorTools. It is mostly aimed at people extending Kranc or writing
+code generation scripts in Kranc. \textbf{Please be aware that none of
+  the functions listed are guaranteed to be supported or included in
+  future versions of Kranc. Use this reference at your own risk.}
+
 \section{User-Level Kranc Commands}
 \label{ch:ref:sec:kranc}