diff --git a/src/model/mod.rs b/src/model/mod.rs
index 8def73e..0607db0 100755
--- a/src/model/mod.rs
+++ b/src/model/mod.rs
@@ -58,12 +58,16 @@ enum ModelFlags1 {
     DustOcclusionEnabled = 0x80,
     SnowOcclusionEnabled = 0x40,
     RainOcclusionEnabled = 0x20,
-    Unknown1 = 0x10,
     LightingReflectionEnabled = 0x08,
     WavingAnimationDisabled = 0x04,
     LightShadowDisabled = 0x02,
     ShadowDisabled = 0x01,
+
+    // NOTE: these are most likely a combination of other flags
+    Unknown1 = 0x10,
     Unknown2 = 0x5, // TODO: seen in some bgparts
+    Unknown3 = 0xE4, // TODO: seen in some bgparts
+    Unknown4 = 0xE5, // TODO: seen in some bgparts
 }
 
 #[binrw]