diff --git a/9-square.png b/9-square.png
index b163d3f..2cff108 100644
Binary files a/9-square.png and b/9-square.png differ
diff --git a/HFI-2018.pgw b/HFI-2018.pgw
index bc1444e..7196e72 100644
--- a/HFI-2018.pgw
+++ b/HFI-2018.pgw
@@ -1,6 +1,6 @@
-613.32217183544287309
+591.7775015612161269
 0
 0
--613.32217183544287309
-2154319.76557658240199089
-7765489.88401408214122057
+-591.7775015612161269
+2238589.48885078076273203
+7748253.92202259693294764
diff --git a/HFI-2018.png b/HFI-2018.png
index b20aba0..02c39a2 100644
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diff --git a/README.md b/README.md
index f47ef09..74f7b52 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,8 @@ Implementation of https://www.nature.com/articles/s41597-022-01284-8 for New Zea
 
 ![Human Footprint Index for 2018](<HFI-2018.png>)
 
+NB: the workflow is capable of generating a GeoTIFF (projection: [NZGD2000 / NZCS2000](https://epsg.io/3851)) which has an extent and a pressure score for all [NZ outlying islands](https://en.wikipedia.org/wiki/New_Zealand_outlying_islands), not just the mainland. This does not include the Ross Dependency (including the Balleny Islands), Tokelau, the Cook Islands, or Niue.
+
 ![Components of the Human Footprint Index for 2018](<9-square.png>)