Add documentation for the StopIteration exception.
diff --git a/Doc/lib/libexcs.tex b/Doc/lib/libexcs.tex
index 30b4ef5..eb043fc 100644
--- a/Doc/lib/libexcs.tex
+++ b/Doc/lib/libexcs.tex
@@ -237,6 +237,14 @@
more.)
\end{excdesc}
+\begin{excdesc}{StopIteration}
+ Raised by an iterator's \method{next()} method to signal that there
+ are no further values.
+ This is derived from \exception{Exception} rather than
+ \exception{StandardError}, since this is not considered an error in
+ its normal application.
+\end{excdesc}
+
\begin{excdesc}{SyntaxError}
% XXXJH xref to these functions?
Raised when the parser encounters a syntax error. This may occur in