diff --git a/vector-space.md b/vector-space.md
index 0879890..ef94b7d 100644
--- a/vector-space.md
+++ b/vector-space.md
@@ -53,7 +53,7 @@ I really don't at this point have any idea what sorts of things we'll want to st
 
 ### BMAP
 
-A bitmap; a monochrome raster; a two dimensional vector of bits.
+A bitmap; a monochrome raster; a two dimensional array of bits.
 
 ### EXEC
 
@@ -73,8 +73,8 @@ A lot of thinking needs to be done here. It's tricky. If I get it wrong, the cos
 
 ### RSTR
 
-A raster; a two dimensional vector of 32 bit integers, typically interpreted as RGBA colour values.
+A raster; a two dimensional array of 32 bit integers, typically interpreted as RGBA colour values.
 
 ### VECT
 
-An actual vector. Has a finite number of dimensions, but probably not more than 4,294,967,296 will be supported (i.e. 32 bits for `dimensions`).
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+An actual vector; an array with cells of a fixed type (where, obviously, a cons pointer is one type). Has a finite number of dimensions, but probably not more than 4,294,967,296 will be supported (i.e. 32 bits for `dimensions`).
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