diff --git a/sound_id.py b/sound_id.py
index 21d95d6..92ec3a6 100644
--- a/sound_id.py
+++ b/sound_id.py
@@ -75,6 +75,8 @@ CATEGORY_GROUPS = {
         "Car", "Engine", "Idling", "Truck", "Bus", "Motorcycle",
         "Aircraft", "Aircraft engine", "Helicopter",
         "Train", "Railroad car, train wagon",
+        "Inside, small room", "Inside, large room or hall",
+        "Outside, urban or manmade", "Outside, rural or natural",
     ],
     "silence": [
         "Silence", "White noise", "Static",