[tlhIngan Hol] comma between nouns joined by je

Suppose we write: {vutwI' Duj nISwI' 'obe' je}. To avoid misunderstandings, it would be a good idea to place a comma as such: {vutwI' Duj, nISwI' 'obe' je}. So far so good; but now I wonder.. If we had a simple construction as {tlhInganpu' Humanpu' je}, would it be wrong to write {tlhInganpu', Humanpu' je} ? Is there a rule or reason which prohibits the placement of a comma between two "simple" nouns joined by {je} ? Now, perhaps someone wonders "why would I want to do that?" For reasons of consistency. If I'm placing a comma between two compound nouns, then why not place a comma between two "simple" nouns too ? ~ mayqel qunen'oS