RTL Styling 101 mentions the word-break property for line breaks, but there other properties that may behave the same (or introduce line breaks):

• overflow-wrap (docs on MDN) which is the new name for word-wrap (supported as far as IE 5)
• hyphens (docs on MDN)— albeit it should depend on the current language dictionnary I wonder what happens with Arabic or other RTL languages.

It might be valuable that the guide mentions at least overflow-wrap and word-wrap, I guess :)

FYI, in Bootstrap the .word-wrap utility combines both word-wrap and word-break properties, until overflow-wrap support gets better.