diff --git a/book/troubleshooting/crumb-structures.tex b/book/troubleshooting/crumb-structures.tex
index c28f5bf..074a7c8 100644
--- a/book/troubleshooting/crumb-structures.tex
+++ b/book/troubleshooting/crumb-structures.tex
@@ -76,7 +76,7 @@ of this bread compared to an open crumb.
 
 \begin{figure}
   \includegraphics[width=\textwidth]{fermented-too-long}
-  \caption{A relatively flat dough that has many tiny pockets of air.}%
+  \caption[Overfermented sourdough bread]{A relatively flat dough that has many tiny pockets of air.}%
   \label{fig:fermented-too-long}
 \end{figure}
 
diff --git a/book/troubleshooting/crumb-structures/fermented-too-long.JPG b/book/troubleshooting/crumb-structures/fermented-too-long.jpg
similarity index 100%
rename from book/troubleshooting/crumb-structures/fermented-too-long.JPG
rename to book/troubleshooting/crumb-structures/fermented-too-long.jpg