diff --git a/core/constants.py b/core/constants.py
index f581033..3efb76a 100644
--- a/core/constants.py
+++ b/core/constants.py
@@ -9,7 +9,7 @@ SOFTWARE_VERSION = "0.1"
 HTTP_HEADERS = {"User-Agent": SOFTWARE_NAME + " " + SOFTWARE_VERSION + " (operated by " + SERVER_OWNER_CALLSIGN + ")"}
 
 # Special Interest Groups
-SIGS = ["POTA", "SOTA", "WWFF", "GMA", "WWBOTA", "HEMA", "MOTA", "ARLHS", "SiOTA", "WCA"]
+SIGS = ["POTA", "SOTA", "WWFF", "GMA", "WWBOTA", "HEMA", "MOTA", "ARLHS", "ILLW", "SiOTA", "WCA", "MOTA", "ZLOTA", "IOTA"]
 
 # Modes. Note "DIGI" and "DIGITAL" are also supported but are normalised into "DATA".
 CW_MODES = ["CW"]
diff --git a/webassets/apidocs/openapi.yml b/webassets/apidocs/openapi.yml
index 49765be..5d916d4 100644
--- a/webassets/apidocs/openapi.yml
+++ b/webassets/apidocs/openapi.yml
@@ -82,6 +82,7 @@ paths:
               - ARLHS
               - ILLW
               - ZLOTA
+              - IOTA
         - name: band
           in: query
           description: "Limit the spots to only ones from one or more bands. To select more than one band, supply a comma-separated list."
@@ -266,6 +267,7 @@ paths:
               - ARLHS
               - ILLW
               - ZLOTA
+              - IOTA
         - name: dx_continent
           in: query
           description: "Limit the alerts to only ones where the DX (the operator being spotted) is on the given continent(s). To select more than one continent, supply a comma-separated list."
@@ -698,6 +700,7 @@ components:
             - ARLHS
             - ILLW
             - ZLOTA
+            - IOTA
           example: POTA
         sig_refs:
           type: array
@@ -849,6 +852,7 @@ components:
             - ARLHS
             - ILLW
             - ZLOTA
+            - IOTA
           example: POTA
         sig_refs:
           type: array