Is matrix concatenation backwards in Android???

Question

I would expect (based on intuition, and the implementation of AffineTransform in Java):

a.postConcat(b) ->  a = a x b  
a.preConcat(b) -> a = b x a

but according to the android documentation:

public boolean preConcat (Matrix other)  

Preconcats the matrix with the specified matrix. M' = M x other

public boolean postConcat (Matrix other)  

Postconcats the matrix with the specified matrix. M' = other x M

This seems backwards to me, am I missing something?