diff --git a/SabreTools.RedumpLib.Test/Data/ExtensionsTests.cs b/SabreTools.RedumpLib.Test/Data/ExtensionsTests.cs
index bd4768c..a653d20 100644
--- a/SabreTools.RedumpLib.Test/Data/ExtensionsTests.cs
+++ b/SabreTools.RedumpLib.Test/Data/ExtensionsTests.cs
@@ -1298,6 +1298,7 @@ namespace SabreTools.RedumpLib.Test.Data
             [RedumpSystem.PhotoCD] = SystemCategory.Other,
             [RedumpSystem.PlayStationGameSharkUpdates] = SystemCategory.Other,
             [RedumpSystem.PocketPC] = SystemCategory.Other,
+            [RedumpSystem.Psion] = SystemCategory.Other,
             [RedumpSystem.RainbowDisc] = SystemCategory.Other,
             [RedumpSystem.SegaPrologue21MultimediaKaraokeSystem] = SystemCategory.Other,
             [RedumpSystem.SharpZaurus] = SystemCategory.Other,
@@ -1646,6 +1647,7 @@ namespace SabreTools.RedumpLib.Test.Data
             RedumpSystem.PalmOS,
             RedumpSystem.PhotoCD,
             RedumpSystem.PocketPC,
+            RedumpSystem.Psion,
             RedumpSystem.RainbowDisc,
             RedumpSystem.SharpZaurus,
             RedumpSystem.SegaPrologue21MultimediaKaraokeSystem,
diff --git a/SabreTools.RedumpLib/Data/Enumerations.cs b/SabreTools.RedumpLib/Data/Enumerations.cs
index a7b284a..5b33d6c 100644
--- a/SabreTools.RedumpLib/Data/Enumerations.cs
+++ b/SabreTools.RedumpLib/Data/Enumerations.cs
@@ -2467,6 +2467,9 @@ namespace SabreTools.RedumpLib.Data
         [System(Category = SystemCategory.Other, LongName = "Pocket PC", ShortName = "ppc", HasCues = true, HasDat = true)]
         PocketPC,
 
+        [System(Category = SystemCategory.Other, Available = false, LongName = "Psion")]
+        Psion,
+
         [System(Category = SystemCategory.Other, Available = false, LongName = "Rainbow Disc")]
         RainbowDisc,
 
diff --git a/SabreTools.RedumpLib/Data/Extensions.cs b/SabreTools.RedumpLib/Data/Extensions.cs
index f53f446..ef82f65 100644
--- a/SabreTools.RedumpLib/Data/Extensions.cs
+++ b/SabreTools.RedumpLib/Data/Extensions.cs
@@ -722,6 +722,11 @@ namespace SabreTools.RedumpLib.Data
                     types.Add(MediaType.CDROM);
                     break;
 
+                // UNKNOWN
+                case RedumpSystem.Psion:
+                    types.Add(MediaType.CDROM);
+                    break;
+
                 // https://en.wikipedia.org/wiki/Doors_and_Windows_(EP)
                 case RedumpSystem.RainbowDisc:
                     types.Add(MediaType.CDROM);