diff --git a/clients/radarr_client.py b/clients/radarr_client.py
index e1faf78..4c6ce24 100644
--- a/clients/radarr_client.py
+++ b/clients/radarr_client.py
@@ -31,6 +31,11 @@ except ImportError:
 class RadarrClient:
     """Enhanced Radarr API client with improved import date detection"""
     
+    # Radarr API numeric event types:
+    # 1 = "grabbed" (when release is grabbed/downloaded)
+    # 3 = "imported" (when file is imported to library)
+    # These come from Radarr's EventType enum in the API/database
+    
     # Known Radarr event types that indicate actual imports
     REAL_IMPORT_EVENTS = {
         # Primary events to check first