diff --git a/OpenRA.Game/Traits/TraitsInterfaces.cs b/OpenRA.Game/Traits/TraitsInterfaces.cs
index 850b5e92ff..0ed83fa185 100644
--- a/OpenRA.Game/Traits/TraitsInterfaces.cs
+++ b/OpenRA.Game/Traits/TraitsInterfaces.cs
@@ -104,6 +104,7 @@ namespace OpenRA.Traits
 	public interface INotifyEffectiveOwnerChanged { void OnEffectiveOwnerChanged(Actor self, Player oldEffectiveOwner, Player newEffectiveOwner); }
 	public interface INotifyCapture { void OnCapture(Actor self, Actor captor, Player oldOwner, Player newOwner); }
 	public interface INotifyInfiltrated { void Infiltrated(Actor self, Actor infiltrator); }
+	public interface INotifyDiscovered { void OnDiscovered(Actor self, Player discoverer, bool playNotification); }
 	public interface IDisableMove { bool MoveDisabled(Actor self); }
 
 	public interface ISeedableResource { void Seed(Actor self); }
diff --git a/OpenRA.Mods.Common/Traits/Player/EnemyWatcher.cs b/OpenRA.Mods.Common/Traits/Player/EnemyWatcher.cs
index 257995df43..115bfce887 100644
--- a/OpenRA.Mods.Common/Traits/Player/EnemyWatcher.cs
+++ b/OpenRA.Mods.Common/Traits/Player/EnemyWatcher.cs
@@ -8,9 +8,7 @@
  */
 #endregion
 
-using System;
 using System.Collections.Generic;
-using System.Drawing;
 using OpenRA.Traits;
 
 namespace OpenRA.Mods.Common.Traits
@@ -25,13 +23,13 @@ namespace OpenRA.Mods.Common.Traits
 		[Desc("Minimal ticks in-between notifications.")]
 		public readonly int NotificationInterval = 750;
 
-		public object Create(ActorInitializer init) { return new EnemyWatcher(init.Self, this); }
+		public object Create(ActorInitializer init) { return new EnemyWatcher(this); }
 	}
 
 	class EnemyWatcher : ITick
 	{
 		readonly EnemyWatcherInfo info;
-		readonly Lazy<RadarPings> radarPings;
+		readonly HashSet<Player> discoveredPlayers;
 
 		bool announcedAny;
 		int rescanInterval;
@@ -40,15 +38,16 @@ namespace OpenRA.Mods.Common.Traits
 		HashSet<uint> visibleActorIds;
 		HashSet<string> playedNotifications;
 
-		public EnemyWatcher(Actor self, EnemyWatcherInfo info)
+		public EnemyWatcher(EnemyWatcherInfo info)
 		{
 			lastKnownActorIds = new HashSet<uint>();
+			discoveredPlayers = new HashSet<Player>();
 			this.info = info;
 			rescanInterval = info.ScanInterval;
 			ticksBeforeNextNotification = info.NotificationInterval;
-			radarPings = Exts.Lazy(() => self.World.WorldActor.Trait<RadarPings>());
 		}
 
+		// Here self is the player actor
 		public void Tick(Actor self)
 		{
 			// TODO: Make the AI handle such notifications and remove Owner.IsBot from this check
@@ -70,9 +69,9 @@ namespace OpenRA.Mods.Common.Traits
 
 			foreach (var actor in self.World.ActorsWithTrait<AnnounceOnSeen>())
 			{
-				// We only care about enemy actors (creeps should be enemies)
-				if ((actor.Actor.EffectiveOwner != null && self.Owner.Stances[actor.Actor.EffectiveOwner.Owner] != Stance.Enemy)
-				 || self.Owner.Stances[actor.Actor.Owner] != Stance.Enemy)
+				// We don't want notifications for allied actors
+				if ((actor.Actor.EffectiveOwner != null && self.Owner.Stances[actor.Actor.EffectiveOwner.Owner] == Stance.Ally)
+				 || self.Owner.Stances[actor.Actor.Owner] == Stance.Ally)
 					continue;
 
 				if (actor.Actor.IsDead || !actor.Actor.IsInWorld)
@@ -88,12 +87,28 @@ namespace OpenRA.Mods.Common.Traits
 				if (lastKnownActorIds.Contains(actor.Actor.ActorID))
 					continue;
 
+				var notificationPlayed = playedNotifications.Contains(actor.Trait.Info.Notification);
+
+				// Notify the actor that he has been discovered
+				foreach (var trait in actor.Actor.TraitsImplementing<INotifyDiscovered>())
+					trait.OnDiscovered(actor.Actor, self.Owner, !notificationPlayed);
+
+				var discoveredPlayer = actor.Actor.Owner;
+				if (!discoveredPlayers.Contains(discoveredPlayer))
+				{
+					// Notify the actor's owner that he has been discovered
+					foreach (var trait in discoveredPlayer.PlayerActor.TraitsImplementing<INotifyDiscovered>())
+						trait.OnDiscovered(actor.Actor, self.Owner, false);
+
+					discoveredPlayers.Add(discoveredPlayer);
+				}
+
 				// We have already played this type of notification
-				if (playedNotifications.Contains(actor.Trait.Info.Notification))
+				if (notificationPlayed)
 					continue;
 
-				if (self.Owner == self.World.RenderPlayer)
-					Announce(self, actor);
+				playedNotifications.Add(actor.Trait.Info.Notification);
+				announcedAny = true;
 			}
 
 			if (announcedAny)
@@ -101,18 +116,5 @@ namespace OpenRA.Mods.Common.Traits
 
 			lastKnownActorIds = visibleActorIds;
 		}
-
-		void Announce(Actor self, TraitPair<AnnounceOnSeen> announce)
-		{
-			// Audio notification
-			Sound.PlayNotification(self.World.Map.Rules, self.Owner, "Speech", announce.Trait.Info.Notification, self.Owner.Country.Race);
-
-			// Radar notificaion
-			if (announce.Trait.Info.PingRadar && radarPings.Value != null)
-				radarPings.Value.Add(() => true, announce.Actor.CenterPosition, Color.Red, 50);
-
-			playedNotifications.Add(announce.Trait.Info.Notification);
-			announcedAny = true;
-		}
 	}
 }
\ No newline at end of file
diff --git a/OpenRA.Mods.Common/Traits/Sound/AnnounceOnSeen.cs b/OpenRA.Mods.Common/Traits/Sound/AnnounceOnSeen.cs
index f7277d645a..51a0fa8c7e 100644
--- a/OpenRA.Mods.Common/Traits/Sound/AnnounceOnSeen.cs
+++ b/OpenRA.Mods.Common/Traits/Sound/AnnounceOnSeen.cs
@@ -8,6 +8,8 @@
  */
 #endregion
 
+using System;
+using System.Drawing;
 using OpenRA.Traits;
 
 namespace OpenRA.Mods.Common.Traits
@@ -18,18 +20,35 @@ namespace OpenRA.Mods.Common.Traits
 		[Desc("Should there be a radar ping on enemies' radar at the actor's location when they see him")]
 		public readonly bool PingRadar = false;
 
-		public readonly string Notification = "EnemyUnitSighted";
+		public readonly string Notification = null;
 
-		public object Create(ActorInitializer init) { return new AnnounceOnSeen(this); }
+		public object Create(ActorInitializer init) { return new AnnounceOnSeen(init.Self, this); }
 	}
 
-	public class AnnounceOnSeen
+	public class AnnounceOnSeen : INotifyDiscovered
 	{
 		public readonly AnnounceOnSeenInfo Info;
 
-		public AnnounceOnSeen(AnnounceOnSeenInfo info)
+		readonly Lazy<RadarPings> radarPings;
+
+		public AnnounceOnSeen(Actor self, AnnounceOnSeenInfo info)
 		{
 			Info = info;
+			radarPings = Exts.Lazy(() => self.World.WorldActor.Trait<RadarPings>());
+		}
+
+		public void OnDiscovered(Actor self, Player discoverer, bool playNotification)
+		{
+			if (!playNotification || discoverer != self.World.RenderPlayer)
+				return;
+
+			// Audio notification
+			if (discoverer != null && !string.IsNullOrEmpty(Info.Notification))
+				Sound.PlayNotification(self.World.Map.Rules, discoverer, "Speech", Info.Notification, discoverer.Country.Race);
+
+			// Radar notificaion
+			if (Info.PingRadar && radarPings.Value != null)
+				radarPings.Value.Add(() => true, self.CenterPosition, Color.Red, 50);
 		}
 	}
 }
\ No newline at end of file