Is that what that means?  Are you sure?

There's no doubt about it in NuVoc:

http://www.jsoftware.com/jwiki/Vocabulary/Words#Control_Words

Some inflected names, such as if., do., and end., are control words. They are used to control program flow. These words are treated as sentences in themselves. They break up the executable line into a number of separate sentences -- the control words, and the phrases between the control words.


Henry Rich

On 10/13/2014 10:18 PM, Raul Miller wrote:
    verb def '0 if. 1 do. 2 else. 3 end.' 4
2
    verb def '0 if. 1 do. 2 else. 3 end. 4' 5
4

That's another example of "Control words are used in Explicit
Definition (:) and are punctuation that determine the sequence of
execution."

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