Index: class.c
==================================================================
--- class.c
+++ class.c
@@ -1447,10 +1447,14 @@
             break;
           case OP_LABEL:
             pushback=1;
             ptr=parse_instructions(cla,ptr,hash,compat);
             break;
+          case OP_COLLISIONLAYERS:
+            cl->collisionLayers=i=class_def_misc();
+            if(i&~255) ParseError("CollisionLayers out of range\n");
+            break;
           case 0x0200 ... 0x02FF:
             set_message_ptr(cla,tokenv&255,ptr);
             ptr=parse_instructions(cla,ptr,hash,compat);
             break;
           case 0xC000 ... 0xFFFF:

Index: class.doc
==================================================================
--- class.doc
+++ class.doc
@@ -242,10 +242,14 @@
   object's location.
 
 (Climb <number>)
   Define the Climb variable for this class.
 
+(CollisionLayers <numbers...>)
+  Define the CollisionLayers variable for this class. The format is the
+  same as for Misc4 (see below), but only the low 8-bits are usable.
+
 Compatible
   Sets the Compatible flag for this class.
 
 ,Compatible
   Sets the Compatible flag for this class, but removes the restriction of