diff --git a/install.ps1 b/install.ps1
index f67d62ec..5c41787d 100644
--- a/install.ps1
+++ b/install.ps1
@@ -11,7 +11,7 @@
 
     $ErrorActionPreference = "Stop"
     $defaultInstallUrl = "https://raw.githubusercontent.com/Abdess/retrobios/main/install.py"
-    $defaultInstallSha256 = "1cf3bd0d3985e3a728513be75cb80682fe1e7a9224da6437e8f1cd9b2a3eedb1"
+    $defaultInstallSha256 = "3f6f906ede89a0a6c350a1f85f668a213031ec8e84215595cdbd160c22ed3352"
     $maximumInstallerBytes = 2MB
     $installerExit = 0
     $installer = if ($PSScriptRoot) { Join-Path $PSScriptRoot "install.py" } else { $null }
diff --git a/install.py b/install.py
index 4e3581a9..249846ce 100644
--- a/install.py
+++ b/install.py
@@ -138,6 +138,30 @@ REGION_ALIASES: dict[str, str] = {
     "korea": "south-korea",
     "auto": WORLD_REGION,
     "gb": "uk",
+    "ca": "canada",
+    "br": "brazil",
+    "mx": "mexico",
+    "ar": "argentina",
+    "fr": "france",
+    "de": "germany",
+    "it": "italy",
+    "es": "spain",
+    "nl": "netherlands",
+    "pt": "portugal",
+    "gr": "greece",
+    "pl": "poland",
+    "ru": "russia",
+    "se": "sweden",
+    "no": "norway",
+    "dk": "denmark",
+    "fi": "finland",
+    "cn": "china",
+    "tw": "taiwan",
+    "hk": "hong-kong",
+    "sg": "singapore",
+    "in": "india",
+    "au": "australia",
+    "nz": "new-zealand",
 }
 AREA_TERRITORIES: dict[str, frozenset] = {
     "asia-ntsc": frozenset({"taiwan"}),
diff --git a/install.sh b/install.sh
index c5c3ec4a..199d31e1 100755
--- a/install.sh
+++ b/install.sh
@@ -18,7 +18,7 @@ esac
 TEMP_INSTALLER=""
 TEMP_DIRECTORY=""
 DEFAULT_INSTALL_URL="https://raw.githubusercontent.com/Abdess/retrobios/main/install.py"
-DEFAULT_INSTALL_SHA256="1cf3bd0d3985e3a728513be75cb80682fe1e7a9224da6437e8f1cd9b2a3eedb1"
+DEFAULT_INSTALL_SHA256="3f6f906ede89a0a6c350a1f85f668a213031ec8e84215595cdbd160c22ed3352"
 MAX_INSTALLER_BYTES=2097152
 
 cleanup() {
diff --git a/scripts/region.py b/scripts/region.py
index a299a8a0..bb7cfaf9 100644
--- a/scripts/region.py
+++ b/scripts/region.py
@@ -64,7 +64,9 @@ _PARENT: dict[str, str] = {
 
 REGIONS: frozenset[str] = frozenset({WORLD} | set(REGION_TREE) | set(_PARENT))
 
-# Accepted on the CLI and for legacy profile values.
+# Accepted on the CLI and for legacy profile values. Every territory also
+# answers to its ISO 3166-1 code: `au` alone was unknown, and the closest
+# spelling offered first was `auto`, which means world.
 ALIASES: dict[str, str] = {
     "jp": "japan",
     "ntsc-j": "japan",
@@ -78,6 +80,30 @@ ALIASES: dict[str, str] = {
     "korea": "south-korea",
     "auto": WORLD,
     "gb": "uk",
+    "ca": "canada",
+    "br": "brazil",
+    "mx": "mexico",
+    "ar": "argentina",
+    "fr": "france",
+    "de": "germany",
+    "it": "italy",
+    "es": "spain",
+    "nl": "netherlands",
+    "pt": "portugal",
+    "gr": "greece",
+    "pl": "poland",
+    "ru": "russia",
+    "se": "sweden",
+    "no": "norway",
+    "dk": "denmark",
+    "fi": "finland",
+    "cn": "china",
+    "tw": "taiwan",
+    "hk": "hong-kong",
+    "sg": "singapore",
+    "in": "india",
+    "au": "australia",
+    "nz": "new-zealand",
 }
 
 
diff --git a/tests/test_region.py b/tests/test_region.py
index 0068e364..523951a1 100644
--- a/tests/test_region.py
+++ b/tests/test_region.py
@@ -1048,6 +1048,24 @@ class UnknownRegionSaysWhatToType(unittest.TestCase):
         self.assertIn("Short forms:", str(caught.exception))
 
 
+class CountryCodesNameTheirTerritory(unittest.TestCase):
+    """`au` was unknown while `jp`, `us`, `kr` and `gb` were aliases, and the
+    first spelling offered for it was `auto`, which means world."""
+
+    def test_au_is_australia(self):
+        self.assertEqual(region.parse_requested("au,jp"), ["australia", "japan"])
+
+    def test_every_territory_answers_to_a_two_letter_code(self):
+        areas = set(region.AREA_TERRITORIES)
+        territories = {
+            member for members in region.REGION_TREE.values() for member in members
+        } - areas
+        coded = {
+            target for alias, target in region.ALIASES.items() if len(alias) == 2
+        } | {slug for slug in territories if len(slug) == 2}
+        self.assertEqual(territories - coded, set())
+
+
 
 class GenesisPlusGxUsBiosServesEurope(unittest.TestCase):
     """sms_cart_region_detect returns REGION_USA for any export header
diff --git a/wiki/advanced-usage.md b/wiki/advanced-usage.md
index 0379e491..27ad6818 100644
--- a/wiki/advanced-usage.md
+++ b/wiki/advanced-usage.md
@@ -76,8 +76,9 @@ fall back to Japan. It does not mean "keep all three": when a US BIOS exists for
 a system, the European and Japanese ones are dropped.
 
 Accepted names are territory slugs (`japan`, `north-america`, `europe`,
-`south-korea`, `taiwan`, `brazil`, `france`...) plus short aliases (`jp`, `us`,
-`eu`, `kr`) and the signal spellings (`ntsc-j`, `ntsc-u`, `pal`). Territories
+`south-korea`, `taiwan`, `brazil`, `france`...) plus short aliases (`us`, `eu`,
+and the ISO 3166 code of each territory: `jp`, `kr`, `au`, `br`, `fr`...) and
+the signal spellings (`ntsc-j`, `ntsc-u`, `pal`). Territories
 nest, so `--region europe` keeps a BIOS declared `[france]`, and `--region france`
 keeps one declared `[europe]`.