csprd03 - can add translatable text PR

In section "4.7.7.1 Without an Existing Target" where the PRs about how to modify the target content are listed, the specification
has the following PR:

[[
- Modifiers MAY add translatable text.
]]

I assume it really means "Modifiers MAY add translation of the source text".

Or does it mean one can add text in the <source>? (that would be strange since the PR is in a target-related section.


-yves