diff --git a/slides.tex b/slides.tex
index 97bc46b..e369c38 100644
--- a/slides.tex
+++ b/slides.tex
@@ -539,8 +539,20 @@ $1 = 84
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \section{Unwinding data synthesis from assembly}
 
-\begin{frame}{TODO}
-    \todo{}
+\begin{frame}{What have we got so far?}
+    We now want to \alert{synthesize unwinding data}. \pause{}That means
+    \alert{forgetting the blue part of the previous schemes}.
+
+    \begin{itemize}[<+->]
+        \item Upon entering a function, we know (ABI)
+            \[ \cfa = \reg{rsp} - 8
+            \qquad \ra = \cfa + 8 \]
+        \item For each instruction, we know \alert{how it changes \cfa}.
+        \item We assume \alert{\ra{} constant wrt. \cfa}.
+            \begin{itemize}
+                \item[$\leadsto$] only \cfa{} tracking matters (for unwinding)
+            \end{itemize}
+    \end{itemize}
 \end{frame}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
diff --git a/texlib/specific.sty b/texlib/specific.sty
index cfada16..22bf9f8 100644
--- a/texlib/specific.sty
+++ b/texlib/specific.sty
@@ -13,6 +13,8 @@
 %% DWARF semantics
 \newcommand{\dwcfa}[1]{\texttt{DW\_CFA\_#1}}
 \newcommand{\reg}[1]{\%#1}
+\newcommand{\cfa}{\texttt{CFA}}
+\newcommand{\ra}{\texttt{RA}}
 
 \newcommand{\DWARF}{\operatorname{DWARF}}