diff --git a/schemas/fsssignaldiscovered-v1.0.json b/schemas/fsssignaldiscovered-v1.0.json
index bca93f2..b28df5c 100644
--- a/schemas/fsssignaldiscovered-v1.0.json
+++ b/schemas/fsssignaldiscovered-v1.0.json
@@ -90,6 +90,7 @@
                             "SpawningState": {"type":  "string"},
                             "SpawningFaction" : {"type":  "string"},
                             "SpawningPower" : {"type":  "string"},
+                            "OpposingPower" : {"type":  "string"},
                             "ThreatLevel": {"type": "integer" },
 
                             "patternProperties": {