add an index entry for __getnewargs__()
diff --git a/Doc/lib/libpickle.tex b/Doc/lib/libpickle.tex
index e6e8c7c..9e45a96 100644
--- a/Doc/lib/libpickle.tex
+++ b/Doc/lib/libpickle.tex
@@ -458,6 +458,8 @@
\withsubitem{(copy protocol)}{\ttindex{__getinitargs__()}}
\withsubitem{(instance constructor)}{\ttindex{__init__()}}
+\withsubitem{(copy protocol)}{\ttindex{__getnewargs__()}}
+
New-style types can provide a \method{__getnewargs__()} method that is
used for protocol 2. Implementing this method is needed if the type
establishes some internal invariants when the instance is created, or