diff --git a/specs/udmf_zdoom.txt b/specs/udmf_zdoom.txt
index 04b52d030..12c7c168d 100644
--- a/specs/udmf_zdoom.txt
+++ b/specs/udmf_zdoom.txt
@@ -200,6 +200,10 @@ Note: All <bool> fields default to false unless mentioned otherwise.
 	  useowncolors_bottom = <bool>; // Set to 1 to use the colors set in the sidedef. Default is using the colors from the owning sector.
 	  uppercolor_bottom = <int>;    // Material color of the top of the lower tier.
 	  lowercolor_bottom = <int>;    // Material color of the bottom of the lower tier. (Hardware rendering only.)
+
+      coloradd_top = <int>;         // Additive material color to apply to top section of sidedef. Takes precedence over sector setting. Default is black (0x000000)
+      coloradd_mid = <int>;         // Additive material color to apply to middle section of sidedef. Takes precedence over sector setting. Default is black (0x000000)
+      coloradd_bottom = <int>;      // Additive material color to apply to bottom section of sidedef. Takes precedence over sector setting. Default is black (0x000000)
    }
 
    sector
@@ -272,8 +276,11 @@ Note: All <bool> fields default to false unless mentioned otherwise.
       color_walltop = <int>;          // Material color of top of sector's sidedefs. In OpenGL 2.x and the software renderer this will define the entire wall's color) Default is white (0xffffff)
       color_wallbottom = <int>;       // Material color of bottom of sector's sidedefs (OpenGL 3.x and later only) Default is white (0xffffff)
       color_sprites = <int>;          // Material color of sprites in sector. Default is white (0xffffff)
-      color_add = <int>;              // Additive material color applied to all walls, flats, and sprites within the sector. Default is black (0x0)
 
+      color_flooradd = <int>;         // Additive material color applied to the sector floor. Default is black (0x000000)
+      color_ceilingadd = <int>;       // Additive material color applied to the sector ceiling. Default is black (0x000000)
+      color_spritesadd = <int>;       // Additive material color applied to sprites within the sector. Default is black (0x000000)
+      color_walladd = <int>;          // Additive material color applied to walls within the sector. Default is black (0x000000)
 
       portal_ceil_blocksound = <bool>;     // ceiling portal blocks sound.
       portal_ceil_disabled = <bool>;       // ceiling portal disabled.