Need to indicate relative location of substituent?

[Chem_Mod]

For cycloalkanes it is clear that if there is only one substituent we don't have to place a number before the prefix. Is this also the case for cycloalkenes? Or would I write, for example, 1-bromocyclopentene?

[Chem_Mod]

You need to place a number for cycloalkenes to indicate the relative location of the substituent with respect to the double bond.