diff --git a/specs/udmf_zdoom.txt b/specs/udmf_zdoom.txt
index 78ccd05b4b..da83b70205 100644
--- a/specs/udmf_zdoom.txt
+++ b/specs/udmf_zdoom.txt
@@ -426,8 +426,9 @@ Note: All <bool> fields default to false unless mentioned otherwise.
       floatbobphase = <int>;    // Sets the thing's floatbobphase. Valid phase values are 0-63. Default = -1 (use actor class default).
 
       lm_sampledist = <int>;        // ZDRay lightmap sample distance for the entire map. Defines the map units each lightmap texel covers. Must be in powers of two. Default = 8
-      lm_suncolor = <string>;       // ZDRay lightmap sun color in hex. Default = "FFFFFF"
-      SoftShadowRadius = <float>;   // ZDRay lightmap light and raytraced dynamic light soft shadow amount. Higher values produce softer shadows. Default = 5.0
+      lm_suncolor = <int>;          // ZDRay lightmap sun color. Default is white (0xFFFFFF).
+
+      light_softshadowradius = <float>;   // ZDRay lightmap light and raytraced dynamic light soft shadow amount. Higher values produce softer shadows. Default = 5.0
 
       friendlyseeblocks = <int>;    // How far (in block units) a friendly monster can see other monsters. Default 10
 
diff --git a/src/maploader/udmf.cpp b/src/maploader/udmf.cpp
index 38ec2a0f99..1fd9869c32 100644
--- a/src/maploader/udmf.cpp
+++ b/src/maploader/udmf.cpp
@@ -791,6 +791,7 @@ public:
 				th->friendlyseeblocks = CheckInt(key);
 				break;
 
+			case NAME_light_softshadowradius:
 			case NAME_lm_suncolor:
 			case NAME_lm_sampledist:
 				CHECK_N(Zd | Zdt)
diff --git a/src/namedef_custom.h b/src/namedef_custom.h
index 4545e87461..dbf94dbafc 100644
--- a/src/namedef_custom.h
+++ b/src/namedef_custom.h
@@ -868,7 +868,7 @@ xx(lm_dynamic)
 xx(lm_suncolor)
 
 // Light keywords
-xx(SoftShadowRadius)
+xx(light_softshadowradius)
 
 xx(skew_bottom_type)
 xx(skew_middle_type)