\ref to gitignore, not \label

instructions.tex

@@ -273,7 +273,7 @@ TexMaker and TeXStudio require a configuration change to do this.
   OSX sometimes cares.
   Linux always cares.
 \item \LaTeX{} generates a bunch of temporary files that you don't want to put into version control.
-  Look at Appendix~\label{src:gitignore-example} for a list of extensions.
+  Look at Appendix~\ref{src:gitignore-example} for a list of extensions.
 \end{itemize}
 
 \section{Department of Engineering Information}