Hyphen connecting the prefix/suffix to the root word

[Suteyä Hawnuyu]

In the Learn Na'vi pocket Guide, the prefixes and suffixes have a hyphen connecting the prefix/suffix to the root word.
For example: Na'vi-yä

However, I have seen people exclude the hyphen from the root word.
For example: Na'viyä

So, my question is: in the handbook, is the hyphen for demonstrative purposes only?

[Nìwotxkrr Tìyawn]

Srane, it is merely for other not-so-learned member of our community can understand what we are saying and learn from it.

The same reason people use <> for infixes.

[Suteyä Hawnuyu]

Srane, it is merely for other not-so-learned member of our community can understand what we are saying and learn from it.

The same reason people use <> for infixes.

Sayrung, irayo!