# MATLAB: Can we add a statement in between the codes

Is it possible to add statements in between the codes. For example: If I have a code like this,
r(:,1) = a(:,1) - a(:,2);
Then can I write it as,
r(:,1) = a(:,1)("this is a constant") - a(:,2)("this is a variable");

r = a  - ... % this is a constant    b;       % this is a variable
doc punct  % will get you to the special punctuation including %