Latin punctuation Question

Hello,

I am wanting to have a latin phrase inscribed on a watch for a loved one, but I want to make sure I am punctuating it correctly. The phrase is "dum spiro spero" and my question is whether or not I should include a comma after the word "spiro" so the inscription reads "dum spiro, spero". Is this correct or is the comma not used with latin? Thank you in advance for any assistance you can provide!

Latin Curious