No problem Thal. I'm not sure how you're going to amend the Harbor description but it might be a tad tricky. Due to poor documentation the way Harbor trade works is confusing for a lot of people.
e.g. The documentation does not clearly explain that for a functioning Harbor Trade Connection:
1a. There must also be a Harbor in the Capital;
or
1b. There must exist a Harbor City on the same continent as the Capital and that also has a road or railroad connection to the Capital.
and
2. The game engine must be able to trace an unbroken (explored) line of water tiles (coast/ocean/lake) from the originating Harbor to the destination Harbor.
What this usually means is that both Harbors must be on the same body of water.
The corollary here is that a Harbor will only provide a railroad connection to the Capital if:
a. The Capital also has a Harbor, and is on the same body of water as your city.
or
b. The Capital has a
railroad connection to a Harbor city on the same continent which is on the same body of water as your city.
So a simple sentence like "Harbors also provide railroad connections to the Capital if there is an existing trade connection" will break in scenario 1b. where there is only a road (but no railroad) connection.
I'm not sure how you're going to get all the nuances above into the description. Might be more trouble than it's worth