-\subsection{Argument extraction}
-This transformation makes sure that all of a bindings arguments are always
-bound to variables at the top level of the bound value. Formally, we can
-describe this transformation as follows.
+\subsection{η-abstraction}
+This transformation makes sure that all arguments of a function-typed
+expression are named, by introducing lambda expressions. When combined with
+β-reduction and function inlining below, all function-typed expressions should
+be lambda abstractions or global identifiers.