diff --git a/cons-space.md b/cons-space.md
index a08bd4e..ff1b11c 100644
--- a/cons-space.md
+++ b/cons-space.md
@@ -28,11 +28,11 @@ A reference count counts how many other objects point to this object. When the r
 
 But, suppose seven objects already point to this object; our reference count is now 7. If an eigth object is created which points to this object, we cannot increment the reference count because we no longer have bits to store the incremented value. So we have to leave it at 7. Now, suppose another object which points to this object is freed: do we decrement the reference counter? No: we can't, because we can't know whether the actual number of objects which point to it is seven, or eight, or one hundred.
 
-Consequently, for any size of reference counter, when it hits its maximum value it can no longer be decremented, and consequently a reference counting garbage collector can no longer free that object - ever. It is possible to write a hybrid reference-counting/mark-and-sweep garbage collector, but that is both expensive and complicated. We need a size of reference count which will very, very rarely overflow in practice. That's probably still quite small, but I'm proposing to reserve 24 bits (16,777,216 values).
+Consequently, for any size of reference counter, when it hits its maximum value it can no longer be decremented, and consequently a reference counting garbage collector can no longer free that object - ever. It is possible to write a hybrid reference-counting/mark-and-sweep garbage collector, but that is both expensive and complicated. We need a size of reference count which will very, very rarely overflow in practice. That's probably still quite small, but I'm proposing to reserve 24 bits (16,777,216 values) (in fact the current implementation reserves 32 bits - see [consspaceobject.h](https://github.com/simon-brooke/post-scarcity/blob/master/src/consspaceobject.h)).
 
 ### Mark
 
-A mark and sweep garbage collector actually only needs one mark bit, but I'm allowing 8 simply to make a sensible sized overall record.
+A mark and sweep garbage collector actually only needs one mark bit, but for now it will sit in the same space as the reference count, since we're only using one or other, never both.
 
 ### Access control