diff --git a/src/NzbDrone.Core/Indexers/Definitions/Aither.cs b/src/NzbDrone.Core/Indexers/Definitions/Aither.cs
index a3324507a..c84b177dd 100644
--- a/src/NzbDrone.Core/Indexers/Definitions/Aither.cs
+++ b/src/NzbDrone.Core/Indexers/Definitions/Aither.cs
@@ -8,7 +8,7 @@ using NzbDrone.Core.Messaging.Events;
 
 namespace NzbDrone.Core.Indexers.Definitions
 {
-    [Obsolete]
+    [Obsolete("Moved to YML for Cardigann v3")]
     public class Aither : Unit3dBase
     {
         public override string Name => "Aither";
diff --git a/src/NzbDrone.Core/Indexers/Definitions/AnimeWorld.cs b/src/NzbDrone.Core/Indexers/Definitions/AnimeWorld.cs
index 709a4b118..cd747a5dd 100644
--- a/src/NzbDrone.Core/Indexers/Definitions/AnimeWorld.cs
+++ b/src/NzbDrone.Core/Indexers/Definitions/AnimeWorld.cs
@@ -8,7 +8,7 @@ using NzbDrone.Core.Messaging.Events;
 
 namespace NzbDrone.Core.Indexers.Definitions
 {
-    [Obsolete]
+    [Obsolete("Moved to YML for Cardigann v3")]
     public class AnimeWorld : Unit3dBase
     {
         public override string Name => "AnimeWorld";
diff --git a/src/NzbDrone.Core/Indexers/Definitions/Blutopia.cs b/src/NzbDrone.Core/Indexers/Definitions/Blutopia.cs
index c46c8e97d..e854ed96b 100644
--- a/src/NzbDrone.Core/Indexers/Definitions/Blutopia.cs
+++ b/src/NzbDrone.Core/Indexers/Definitions/Blutopia.cs
@@ -8,7 +8,7 @@ using NzbDrone.Core.Messaging.Events;
 
 namespace NzbDrone.Core.Indexers.Definitions
 {
-    [Obsolete]
+    [Obsolete("Moved to YML for Cardigann v3")]
     public class Blutopia : Unit3dBase
     {
         public override string Name => "Blutopia";
diff --git a/src/NzbDrone.Core/Indexers/Definitions/DesiTorrents.cs b/src/NzbDrone.Core/Indexers/Definitions/DesiTorrents.cs
index ed906e6dc..571d3e904 100644
--- a/src/NzbDrone.Core/Indexers/Definitions/DesiTorrents.cs
+++ b/src/NzbDrone.Core/Indexers/Definitions/DesiTorrents.cs
@@ -9,7 +9,7 @@ using NzbDrone.Core.Parser.Model;
 
 namespace NzbDrone.Core.Indexers.Definitions
 {
-    [Obsolete]
+    [Obsolete("Moved to YML for Cardigann v3")]
     public class DesiTorrents : Unit3dBase
     {
         public override string Name => "DesiTorrents";
diff --git a/src/NzbDrone.Core/Indexers/Definitions/DigitalCore.cs b/src/NzbDrone.Core/Indexers/Definitions/DigitalCore.cs
index 12a26587a..e14dce86e 100644
--- a/src/NzbDrone.Core/Indexers/Definitions/DigitalCore.cs
+++ b/src/NzbDrone.Core/Indexers/Definitions/DigitalCore.cs
@@ -20,7 +20,7 @@ using NzbDrone.Core.Validation;
 
 namespace NzbDrone.Core.Indexers.Definitions
 {
-    [Obsolete]
+    [Obsolete("Moved to YML for Cardigann v3")]
     public class DigitalCore : TorrentIndexerBase<DigitalCoreSettings>
     {
         public override string Name => "DigitalCore";
diff --git a/src/NzbDrone.Core/Indexers/Definitions/InternetArchive.cs b/src/NzbDrone.Core/Indexers/Definitions/InternetArchive.cs
index b5385f479..f59b52f35 100644
--- a/src/NzbDrone.Core/Indexers/Definitions/InternetArchive.cs
+++ b/src/NzbDrone.Core/Indexers/Definitions/InternetArchive.cs
@@ -17,7 +17,7 @@ using NzbDrone.Core.Validation;
 
 namespace NzbDrone.Core.Indexers.Definitions
 {
-    [Obsolete]
+    [Obsolete("Moved to YML for Cardigann v3")]
     public class InternetArchive : TorrentIndexerBase<InternetArchiveSettings>
     {
         public override string Name => "Internet Archive";
diff --git a/src/NzbDrone.Core/Indexers/Definitions/Milkie.cs b/src/NzbDrone.Core/Indexers/Definitions/Milkie.cs
index d1baf4cc8..89cbf2bad 100644
--- a/src/NzbDrone.Core/Indexers/Definitions/Milkie.cs
+++ b/src/NzbDrone.Core/Indexers/Definitions/Milkie.cs
@@ -15,7 +15,7 @@ using NzbDrone.Core.Validation;
 
 namespace NzbDrone.Core.Indexers.Definitions
 {
-    [Obsolete]
+    [Obsolete("Moved to YML for Cardigann v3")]
     public class Milkie : TorrentIndexerBase<MilkieSettings>
     {
         public override string Name => "Milkie";
diff --git a/src/NzbDrone.Core/Indexers/Definitions/ShareIsland.cs b/src/NzbDrone.Core/Indexers/Definitions/ShareIsland.cs
index 9fbeae9fb..1a289e8b6 100644
--- a/src/NzbDrone.Core/Indexers/Definitions/ShareIsland.cs
+++ b/src/NzbDrone.Core/Indexers/Definitions/ShareIsland.cs
@@ -8,7 +8,7 @@ using NzbDrone.Core.Messaging.Events;
 
 namespace NzbDrone.Core.Indexers.Definitions
 {
-    [Obsolete]
+    [Obsolete("Moved to YML for Cardigann v3")]
     public class ShareIsland : Unit3dBase
     {
         public override string Name => "ShareIsland";
diff --git a/src/NzbDrone.Core/Indexers/Definitions/SuperBits.cs b/src/NzbDrone.Core/Indexers/Definitions/SuperBits.cs
index 1ae39db67..46fc865a1 100644
--- a/src/NzbDrone.Core/Indexers/Definitions/SuperBits.cs
+++ b/src/NzbDrone.Core/Indexers/Definitions/SuperBits.cs
@@ -18,7 +18,7 @@ using NzbDrone.Core.Validation;
 
 namespace NzbDrone.Core.Indexers.Definitions
 {
-    [Obsolete]
+    [Obsolete("Moved to YML for Cardigann v3")]
     public class SuperBits : TorrentIndexerBase<SuperBitsSettings>
     {
         public override string Name => "SuperBits";
diff --git a/src/NzbDrone.Core/Indexers/Definitions/ThePirateBay.cs b/src/NzbDrone.Core/Indexers/Definitions/ThePirateBay.cs
index c88fb943c..7f937a98a 100644
--- a/src/NzbDrone.Core/Indexers/Definitions/ThePirateBay.cs
+++ b/src/NzbDrone.Core/Indexers/Definitions/ThePirateBay.cs
@@ -16,7 +16,7 @@ using NzbDrone.Core.Validation;
 
 namespace NzbDrone.Core.Indexers.Definitions
 {
-    [Obsolete]
+    [Obsolete("Moved to YML for Cardigann v3")]
     public class ThePirateBay : TorrentIndexerBase<ThePirateBaySettings>
     {
         public override string Name => "ThePirateBay";
diff --git a/src/NzbDrone.Core/Indexers/Definitions/TorrentLeech.cs b/src/NzbDrone.Core/Indexers/Definitions/TorrentLeech.cs
index b4e256c5e..3e4867382 100644
--- a/src/NzbDrone.Core/Indexers/Definitions/TorrentLeech.cs
+++ b/src/NzbDrone.Core/Indexers/Definitions/TorrentLeech.cs
@@ -20,7 +20,7 @@ using NzbDrone.Core.Validation;
 
 namespace NzbDrone.Core.Indexers.Definitions
 {
-    [Obsolete]
+    [Obsolete("Moved to YML for Cardigann v3")]
     public class TorrentLeech : TorrentIndexerBase<TorrentLeechSettings>
     {
         public override string Name => "TorrentLeech";
diff --git a/src/NzbDrone.Core/Indexers/Definitions/TorrentParadiseMl.cs b/src/NzbDrone.Core/Indexers/Definitions/TorrentParadiseMl.cs
index 7546ac313..00a052014 100644
--- a/src/NzbDrone.Core/Indexers/Definitions/TorrentParadiseMl.cs
+++ b/src/NzbDrone.Core/Indexers/Definitions/TorrentParadiseMl.cs
@@ -18,7 +18,7 @@ using NzbDrone.Core.Validation;
 
 namespace NzbDrone.Core.Indexers.Definitions
 {
-    [Obsolete]
+    [Obsolete("Moved to YML for Cardigann v3")]
     public class TorrentParadiseMl : TorrentIndexerBase<TorrentParadiseMlSettings>
     {
         public override string Name => "TorrentParadiseMl";
diff --git a/src/NzbDrone.Core/Indexers/Definitions/YTS.cs b/src/NzbDrone.Core/Indexers/Definitions/YTS.cs
index 530c976e1..73c00416a 100644
--- a/src/NzbDrone.Core/Indexers/Definitions/YTS.cs
+++ b/src/NzbDrone.Core/Indexers/Definitions/YTS.cs
@@ -18,7 +18,7 @@ using NzbDrone.Core.Validation;
 
 namespace NzbDrone.Core.Indexers.Definitions
 {
-    [Obsolete]
+    [Obsolete("Moved to YML for Cardigann v3")]
     public class YTS : TorrentIndexerBase<YTSSettings>
     {
         public override string Name => "YTS";