Initial revision
diff --git a/Include/listobject.h b/Include/listobject.h
new file mode 100644
index 0000000..76cf86d
--- /dev/null
+++ b/Include/listobject.h
@@ -0,0 +1,26 @@
+/* List object interface */
+
+/*
+123456789-123456789-123456789-123456789-123456789-123456789-123456789-12
+
+Another generally useful object type is an list of object pointers.
+This is a mutable type: the list items can be changed, and items can be
+added or removed. Out-of-range indices or non-list objects are ignored.
+
+*** WARNING *** setlistitem does not increment the new item's reference
+count, but does decrement the reference count of the item it replaces,
+if not nil. It does *decrement* the reference count if it is *not*
+inserted in the list. Similarly, getlistitem does not increment the
+returned item's reference count.
+*/
+
+extern typeobject Listtype;
+
+#define is_listobject(op) ((op)->ob_type == &Listtype)
+
+extern object *newlistobject PROTO((int size));
+extern int getlistsize PROTO((object *));
+extern object *getlistitem PROTO((object *, int));
+extern int setlistitem PROTO((object *, int, object *));
+extern int inslistitem PROTO((object *, int, object *));
+extern int addlistitem PROTO((object *, object *));