diff --git a/src/doomdata.h b/src/doomdata.h
index 5f52607e3..2a7b3503c 100644
--- a/src/doomdata.h
+++ b/src/doomdata.h
@@ -154,6 +154,7 @@ enum ELineFlags : unsigned
 	ML_ADDTRANS					= 0x00000400,	// additive translucency (can only be set internally)
 
 	// Extended flags
+	ML_NOSKYWALLS				= 0x00001000,	// Don't draw sky above or below walls
 	ML_MONSTERSCANACTIVATE		= 0x00002000,	// [RH] Monsters (as well as players) can activate the line
 	ML_BLOCK_PLAYERS			= 0x00004000,
 	ML_BLOCKEVERYTHING			= 0x00008000,	// [RH] Line blocks everything
@@ -171,7 +172,7 @@ enum ELineFlags : unsigned
 	ML_BLOCKHITSCAN				= 0x08000000,	// blocks hitscan attacks
 	ML_3DMIDTEX_IMPASS			= 0x10000000,	// [TP] if 3D midtex, behaves like a height-restricted ML_BLOCKING
 	ML_REVEALED					= 0x20000000,	// set if revealed in automap
-	ML_NOSKYWALLS				= 0x40000000,	// Don't draw sky above or below walls
+	ML_DRAWFULLHEIGHT			= 0x40000000,	// Draw the full height of the upper/lower sections
 	ML_PORTALCONNECT			= 0x80000000,	// for internal use only: This line connects to a sector with a linked portal (used to speed up sight checks.)
 };