Oops! Forgot the value parameter.
diff --git a/Doc/whatsnew/whatsnew22.tex b/Doc/whatsnew/whatsnew22.tex
index 7d3a0d8..e12c591 100644
--- a/Doc/whatsnew/whatsnew22.tex
+++ b/Doc/whatsnew/whatsnew22.tex
@@ -216,7 +216,7 @@
\item \method{__set__(\var{object}, \var{value})} sets the attribute
on \var{object} to \var{value}.
-\item \method{__delete__(\var{object})} deletes the \var{value}
+\item \method{__delete__(\var{object}, \var{value})} deletes the \var{value}
attribute of \var{object}.
\end{itemize}