diff --git a/VolunteerGrid.md b/VolunteerGrid.md
index 4529703..f4e6ba2 100644
--- a/VolunteerGrid.md
+++ b/VolunteerGrid.md
@@ -53,4 +53,6 @@ The following appear in the introducer's list (on 2009-07-11) but have not been
 # rules?
 As the grid is meant to be stable, I think we should work out some rules regarding the usage, to prevent obsessive space usage by users who don't contribute, servers going offline with no warning (Tahoe is resistant against that, but what happens if multiple servers, maybe from the same admin, go away?), incompatible upgrades creating data loss (what happens when Tahoe 1.4 introduces a new storage format, rendering all the already stored chunks unusable), ...
 
-Zooko says: My request is: if you destroy data (by accident or decision), please let me know!  Either send e-mail or post to this page.  I can already announce that I have destroyed some data: draco is inoperative.  Well, maybe the data is still there on the hard disk and will come back someday when I get a paycheck and can pay a repairman to repair draco.
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+Zooko says: My request is: if you destroy data (by accident or decision), please let me know!  Either send e-mail or post to this page.  I can already announce that I have destroyed some data: draco is inoperative.  Well, maybe the data is still there on the hard disk and will come back someday when I get a paycheck and can pay a repairman to repair draco.
+
+If your storage server is behind firewall/NAT, please configure your firewall/NAT to forward a TCP port and edit your `tahoe.cfg` to set `tub.port` and `tub.location` as explained in the source:docs/configuration.txt file.
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