How can I insert simple Table Notes?

I've tried to get some table notes to work in a paper I'm working on.

Here is what my table looks like (minus the details for clarity):

\documentclass[progress]{cmpreport}
\usepackage{enumitem}
\usepackage{wasysym}
\usepackage{framed}
\usepackage{pgfgantt,rotating}
\usepackage{subfloat}
\usepackage{multirow}
\usepackage{blindtext}

...

\begin{document}
\begin{table*}[ht]
\caption{Revisions}
\centering
\begin{tabular}{p{0.10\linewidth}
p{0.15\linewidth}
p{0.45\linewidth}
p{0.20\linewidth}}
\hline
Title 1 & Title 2 & Title 3 & Title 4          \\
\hline
Cell 1  & Cell 1  & Cell 3  & Cell 4 \tnote{a} \\
Cell 1  & Cell 1  & Cell 3  & Cell 4 \tnote{b} \\
\hline
\end{tabular}
\begin{tablenotes}
\item[a] My Note.
\item[b] My Other Note.
\end{tablenotes}
\end{table*}

...

\end{document}


Although they appear below the table, I can not seem to get the superscript reference letter to appear...

I've looked at other examples on here and they seem a lot more complicated tables that this one...

Is there something I'm missing?

You need the threeparttable package.

  \documentclass{article}
\usepackage[flushleft]{threeparttable}
\begin{document}
\begin{table*}[ht]
\caption{Revisions}
\begin{threeparttable}
\centering
\begin{tabular}{p{0.10\linewidth}
p{0.15\linewidth}
p{0.45\linewidth}
p{0.20\linewidth}}
\hline
Title 1 & Title 2 & Title 3 & Title 4          \\
\hline
Cell 1  & Cell 1  & Cell 3  & Cell 4 \tnote{a} \\
Cell 1  & Cell 1  & Cell 3  & Cell 4 \tnote{b} \\
\hline
\end{tabular}
\begin{tablenotes}
\item[a] My Note.
\item[b] My Other Note.
\end{tablenotes}
\end{threeparttable}
\end{table*}
\end{document}