diff --git a/VolunteerGrid.md b/VolunteerGrid.md
index 94bcbc8..3cda4c3 100644
--- a/VolunteerGrid.md
+++ b/VolunteerGrid.md
@@ -50,4 +50,6 @@ As the grid is meant to be stable, I think we should work out some rules regardi
 
 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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+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.
+
+Per ticket #642, please inform Jan-Benedict Glaw of your (approximate) latitude and longitude and that of your servers.  The more privacy you want about your location, then the more approximate of a location that you can report.  If you want so much privacy that you're not comfortable specifying even your continent, then don't bother specifying a location.  ;-)
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