diff --git a/custom_field_list.json b/custom_field_list.json
index b920bfd..3ea61ee 100644
--- a/custom_field_list.json
+++ b/custom_field_list.json
@@ -68,7 +68,15 @@
     ]
 },
 "HORUSRADMON": {
-    "comment": "Horus Radiation Monitor Payload",
+    "comment": "Horus Radiation Monitor Payload, Photodiode",
+    "struct": "<hxxxxxH",
+    "fields": [
+        ["ascent_rate", "divide_by_100"],
+        ["pulse_counts","none"]
+    ]
+},
+"HORUSGEIGER": {
+    "comment": "Horus Radiation Monitor Payload, Geiger Counter",
     "struct": "<hxxxxxH",
     "fields": [
         ["ascent_rate", "divide_by_100"],
diff --git a/payload_id_list.txt b/payload_id_list.txt
index a78cfa5..16cf65e 100644
--- a/payload_id_list.txt
+++ b/payload_id_list.txt
@@ -215,3 +215,4 @@
 31415, HORUS-V2
 31416, ITSWINDY
 31417, HORUSRADMON
+31418, HORUSGEIGER