Clarify that __getinitargs__ is called at pickle time!
diff --git a/Doc/lib/libpickle.tex b/Doc/lib/libpickle.tex
index 508e50d..0d31059 100644
--- a/Doc/lib/libpickle.tex
+++ b/Doc/lib/libpickle.tex
@@ -103,7 +103,9 @@
If it is desirable that the \code{__init__} method be called on
unpickling, a class can define a method \code{__getinitargs__()},
which should return a {\em tuple} containing the arguments to be
-passed to the class constructor (\code{__init__()}).
+passed to the class constructor (\code{__init__()}). This method is
+called at pickle time; the tuple it returns is incorporated in the
+pickle for the instance.
\ttindex{__getinitargs__}
\ttindex{__init__}