diff --git a/specs/udmf_zdoom.txt b/specs/udmf_zdoom.txt
index e79ae196be..f20525d13c 100644
--- a/specs/udmf_zdoom.txt
+++ b/specs/udmf_zdoom.txt
@@ -203,7 +203,11 @@ Note: All <bool> fields default to false unless mentioned otherwise.
                                       // sound sequence thing in the sector will override this property.
       hidden = <bool>;                // if true this sector will not be drawn on the textured automap.
       waterzone = <bool>;             // Sector is under water and swimmable
-	  moreids = <string>;             // Additional sector IDs/tags, specified as a space separated list of numbers (e.g. "2 666 1003 4505")
+      moreids = <string>;             // Additional sector IDs/tags, specified as a space separated list of numbers (e.g. "2 666 1003 4505")
+      damageamount = <int>;           // Amount of damage inflicted by this sector, default = 0
+      damagetype = <string>;          // Damage type for sector damage, Default = "None". (generic damage)
+      damageinterval = <int>;         // Interval in tics between damage application, default = 32.
+      leakiness = <int>;              // Probability of leaking through radiation suit (0 = never, 256 = always), default = 0.
       
       * Note about dropactors
 
@@ -377,6 +381,10 @@ Changed language describing the DIALOGUE lump to mention USDF as an option.
 1.25 19.04.2015
 Added 'moreids' for linedefs and sectors.
 
+1.26 05.01.2016
+added clarification about character encoding
+added sector damage properties.
+
 ===============================================================================
 EOF
 ===============================================================================
diff --git a/src/namedef.h b/src/namedef.h
index f9d436f287..cad58bfa38 100644
--- a/src/namedef.h
+++ b/src/namedef.h
@@ -506,6 +506,10 @@ xx(floorplane_a)
 xx(floorplane_b)
 xx(floorplane_c)
 xx(floorplane_d)
+xx(damageamount)
+xx(damagetype)
+xx(damageinterval)
+xx(leakiness)
 
 // USDF keywords
 xx(Amount)
diff --git a/src/p_udmf.cpp b/src/p_udmf.cpp
index db0c952cf3..89c039aefd 100644
--- a/src/p_udmf.cpp
+++ b/src/p_udmf.cpp
@@ -1299,6 +1299,8 @@ public:
 		sec->prevsec = -1;	// stair retriggering until build completes
 		sec->heightsec = NULL;	// sector used to get floor and ceiling height
 		sec->sectornum = index;
+		sec->damageinterval = 32;
+		sec->leakydamage = 5;
 		if (floordrop) sec->Flags = SECF_FLOORDROP;
 		// killough 3/7/98: end changes
 
@@ -1524,6 +1526,23 @@ public:
 					cp[3] = CheckFloat(key);
 					break;
 
+				case NAME_damageamount:
+					sec->damageamount = CheckInt(key);
+					break;
+
+				case NAME_damagetype:
+					sec->damagetype = CheckString(key);
+					break;
+
+				case NAME_damageinterval:
+					sec->damageinterval = CheckInt(key);
+					if (sec->damageinterval < 1) sec->damageinterval = 1;
+					break;
+
+				case NAME_leakiness:
+					sec->leakydamage = CheckInt(key);
+					break;
+
 				case NAME_MoreIds:
 					// delay parsing of the tag string until parsing of the sector is complete
 					// This ensures that the ID is always the first tag in the list.