diff --git a/code/__DEFINES/atmospherics_defines.dm b/code/__DEFINES/atmospherics_defines.dm
index 5cdec032861..97a736cbfc2 100644
--- a/code/__DEFINES/atmospherics_defines.dm
+++ b/code/__DEFINES/atmospherics_defines.dm
@@ -152,10 +152,10 @@
 #define N2O_DECOMPOSITION_MIN_ENERGY		1400
 #define N2O_DECOMPOSITION_ENERGY_RELEASED	200000
 
-// From milla/src/lib.rs
-#define ATMOS_MODE_SPACE 0
-#define ATMOS_MODE_SEALED 1
-#define ATMOS_MODE_EXPOSED_TO_ENVIRONMENT 2
+// From milla/src/model.rs, line 126
+#define ATMOS_MODE_SPACE 0						//! Tile is exposed to space and loses air every second
+#define ATMOS_MODE_SEALED 1						//! Tile has no special behaviour
+#define ATMOS_MODE_EXPOSED_TO_ENVIRONMENT 2		//! Tile is exposed to the environment, ex: lavaland
 
 /// Lavaland environment: hot, low pressure.
 #define ENVIRONMENT_LAVALAND "lavaland"