Make it clear that copy_reg.pickle() should not be used for classes, but
only for extension types.
This partially fixes SourceForge bug #116295.
diff --git a/Doc/lib/libcopyreg.tex b/Doc/lib/libcopyreg.tex
index 2d5c47e..2032172 100644
--- a/Doc/lib/libcopyreg.tex
+++ b/Doc/lib/libcopyreg.tex
@@ -20,9 +20,10 @@
\begin{funcdesc}{pickle}{type, function\optional{, constructor}}
Declares that \var{function} should be used as a ``reduction''
- function for objects of type or class \var{type}. \var{function}
- should return either a string or a tuple. The optional
- \var{constructor} parameter, if provided, is a callable object which
- can be used to reconstruct the object when called with the tuple of
- arguments returned by \var{function} at pickling time.
+ function for objects of type \var{type}; \var{type} should not a
+ class object. \var{function} should return either a string or a
+ tuple. The optional \var{constructor} parameter, if provided, is a
+ callable object which can be used to reconstruct the object when
+ called with the tuple of arguments returned by \var{function} at
+ pickling time.
\end{funcdesc}