diff --git a/src/NzbDrone.Core/Indexers/Definitions/Cardigann/CardigannParser.cs b/src/NzbDrone.Core/Indexers/Definitions/Cardigann/CardigannParser.cs
index d429a6a5f..1dd78fb48 100644
--- a/src/NzbDrone.Core/Indexers/Definitions/Cardigann/CardigannParser.cs
+++ b/src/NzbDrone.Core/Indexers/Definitions/Cardigann/CardigannParser.cs
@@ -464,6 +464,22 @@ namespace NzbDrone.Core.Indexers.Cardigann
                         }
                     }
 
+                    value = release.Categories.ToString();
+                    break;
+                case "categorydesc":
+                    var catsDesc = MapTrackerCatDescToNewznab(value);
+                    if (catsDesc.Any())
+                    {
+                        if (release.Categories == null || fieldModifiers.Contains("noappend"))
+                        {
+                            release.Categories = catsDesc;
+                        }
+                        else
+                        {
+                            release.Categories = release.Categories.Union(catsDesc).ToList();
+                        }
+                    }
+
                     value = release.Categories.ToString();
                     break;
                 case "size":