Missed a bit of the skullstorm override system. Fixed that and updated documentation.

levels/README.md

@@ -259,6 +259,32 @@ The `static` property means objects don't move - they stay in their fixed positi
 
 The `maximum_skulls` setting controls how many skulls can be falling simultaneously. `frequency` is the number of seconds that can elapse before the next skull falls.
 
+**Skull Storm Sound Overrides:**
+```json
+{
+    "x_range": [40, 60],
+    "y": 12,
+    "type": "skull_storm",
+    "damage": 4,
+    "maximum_skulls": 2,
+    "frequency": {"min": 1, "max": 4},
+    "sound_overrides": {
+        "skull_storm": "reindeer",
+        "falling_skull": "falling_poop",
+        "skull_lands": "poop_splat",
+        "end_message": "The reindeer fly away.",
+        "hit_message": "Hit by reindeer poop!"
+    }
+}
+```
+
+**Override Properties:**
+- `skull_storm`: Sound when entering the skull storm area
+- `falling_skull`: Sound of skulls falling (system automatically uses numbered variants: falling_poop1, falling_poop2, etc. if they exist)
+- `skull_lands`: Sound when skulls hit the ground
+- `end_message`: TTS message when leaving the skull storm area
+- `hit_message`: TTS message when hit by a falling skull
+
 #### Catapult
 ```json
 {