diff --git a/src/p_setup.c b/src/p_setup.c
index 5d38791ad..c949ec62f 100644
--- a/src/p_setup.c
+++ b/src/p_setup.c
@@ -1428,6 +1428,10 @@ static void P_LoadSidedefs(UINT8 *data)
 			case 459: // Control text prompt (named tag)
 			case 461: // Spawns an object on the map based on texture offsets
 			case 463: // Colorizes an object
+			case 475: // ACS_Execute
+			case 476: // ACS_ExecuteAlways
+			case 477: // ACS_Suspend
+			case 478: // ACS_Terminate
 			{
 				char process[8*3+1];
 				memset(process,0,8*3+1);
@@ -5918,10 +5922,10 @@ static void P_ConvertBinaryLinedefTypes(void)
 			lines[i].args[2] = TML_SECTOR;
 			lines[i].args[3] = !!(lines[i].flags & ML_MIDPEG);
 			break;
-		case 475: // ACS funcs
-		case 476:
-		case 477:
-		case 478:
+		case 475: // ACS_Execute
+		case 476: // ACS_ExecuteAlways
+		case 477: // ACS_Suspend
+		case 478: // ACS_Terminate
 			if (sides[lines[i].sidenum[0]].text)
 			{
 				lines[i].stringargs[0] = Z_Malloc(strlen(sides[lines[i].sidenum[0]].text) + 1, PU_LEVEL, NULL);
diff --git a/src/p_spec.c b/src/p_spec.c
index e773665ea..4bf00408c 100644
--- a/src/p_spec.c
+++ b/src/p_spec.c
@@ -4152,7 +4152,7 @@ boolean P_ProcessSpecial(activator_t *activator, INT16 special, INT32 *args, cha
 		}
 		break;
 
-		case 475:
+		case 475: // ACS_Execute
 			if (!stringargs[0])
 			{
 				CONS_Debug(DBG_GAMELOGIC, "Linedef type 475: No script name given\n");
@@ -4161,7 +4161,7 @@ boolean P_ProcessSpecial(activator_t *activator, INT16 special, INT32 *args, cha
 
 			ACS_Execute(stringargs[0], args, NUMLINEARGS, activator);
 			break;
-		case 476:
+		case 476: // ACS_ExecuteAlways
 			if (!stringargs[0])
 			{
 				CONS_Debug(DBG_GAMELOGIC, "Linedef type 476: No script name given\n");
@@ -4170,7 +4170,7 @@ boolean P_ProcessSpecial(activator_t *activator, INT16 special, INT32 *args, cha
 
 			ACS_ExecuteAlways(stringargs[0], args, NUMLINEARGS, activator);
 			break;
-		case 477:
+		case 477: // ACS_Suspend
 			if (!stringargs[0])
 			{
 				CONS_Debug(DBG_GAMELOGIC, "Linedef type 477: No script name given\n");
@@ -4179,7 +4179,7 @@ boolean P_ProcessSpecial(activator_t *activator, INT16 special, INT32 *args, cha
 
 			ACS_Suspend(stringargs[0]);
 			break;
-		case 478:
+		case 478: // ACS_Terminate
 			if (!stringargs[0])
 			{
 				CONS_Debug(DBG_GAMELOGIC, "Linedef type 478: No script name given\n");