Minor clarification about the ob_size field.
diff --git a/Doc/api/newtypes.tex b/Doc/api/newtypes.tex
index d9f0f06..b7014c4 100644
--- a/Doc/api/newtypes.tex
+++ b/Doc/api/newtypes.tex
@@ -461,9 +461,9 @@
example, long ints use a negative \member{ob_size} to indicate a
negative number, and N is \code{abs(\member{ob_size})} there. Also,
the presence of an \member{ob_size} field in the instance layout
- doesn't mean that the type is variable-length (for example, the list
- type has fixed-length instances, yet those instances have a
- meaningful \member{ob_size} field).
+ doesn't mean that the instance structure is variable-length (for
+ example, the structure for the list type has fixed-length instances,
+ yet those instances have a meaningful \member{ob_size} field).
The basic size includes the fields in the instance declared by the
macro \csimplemacro{PyObject_HEAD} or