Add a (very) simple description of PyType_Ready().
diff --git a/Doc/api/concrete.tex b/Doc/api/concrete.tex
index fd8ac4a..f175ff1 100644
--- a/Doc/api/concrete.tex
+++ b/Doc/api/concrete.tex
@@ -75,6 +75,10 @@
\end{cfuncdesc}
\begin{cfuncdesc}{int}{PyType_Ready}{PyTypeObject *type}
+ Finalize a type object. This should be called on all type objects
+ to finish their initialization. This function is responsible for
+ adding inherited slots from a type's base class. Returns \code{0}
+ on success, or returns \code{-1} and sets an exception on error.
\versionadded{2.2}
\end{cfuncdesc}