diff --git a/latex/presentations/midterm/sections/appendix.tex b/latex/presentations/midterm/sections/appendix.tex
index d29c34a..27a9303 100644
--- a/latex/presentations/midterm/sections/appendix.tex
+++ b/latex/presentations/midterm/sections/appendix.tex
@@ -113,9 +113,8 @@
         \end{subfigure}%
     \end{figure}
 
-    \footnotetext{In an AWGN Channel $L\left( \boldsymbol{y} \mid \boldsymbol{x} \right)
-                \propto \frac{1}{2} \left| \boldsymbol{x} - \boldsymbol{y} \right|^2
-                \Rightarrow \nabla L\left( \boldsymbol{y} \mid \boldsymbol{x}\right)
-                    \propto \left( \boldsymbol{x} - \boldsymbol{y} \right) $}
+    \footnotetext{In an AWGN Channel $\nabla L\left( \boldsymbol{y} \mid \boldsymbol{x}\right)
+                    \propto \left( \boldsymbol{x} - \boldsymbol{y} \right)$
+                    \cite[Sec. 4.1]{proximal_paper}}
 
 \end{frame}