Minor.

_posts/2017-10-31-Arrays-and-Pointers.md

@@ -7,7 +7,7 @@ There are some pretty widespread misconceptions about arrays and pointers in C.
 Arrays and pointers are different but related things. I think the idea’s pretty
 easy to get, but you have to approach it the right way.
 
-So, first, go read the post about [Types and Objects](2017-10-31-Types-and-Objects).
+So, first, go read the post about [Types and Objects](https://rjmccall.github.io/2017-10-31-Types-and-Objects).
 
 Array types in C are complete object types, for the most part like any
 other object type. Recall that a complete object type describes a set of

_posts/2017-10-31-Types-and-Objects.md

@@ -3,8 +3,10 @@ layout: post
 title: C types and objects
 ---
 
+This post is most meant as a common background for other posts.
+
 Most types in C are what are called *complete object types*, which is to say,
-they define a set of expressible values.
+they define a set of expressible values. Not all types do!
 
 For example, ``int`` is a type which can express a certain range of positive
 and negative integers, and ``struct int_pair`` is a type which can express