diff --git a/src/l/struct.658 b/src/l/struct.658
index aa83fea8..2c5adcbc 100644
--- a/src/l/struct.658
+++ b/src/l/struct.658
@@ -715,7 +715,7 @@ PG$		MRA PAGING
 		MRA PPN
 20$ 		MRA PS
 IFN ITS,[
-		MRA [ITS,AI,ML,MC,MD,MX,DB,KA,KL]
+		MRA [ITS,AI,ML,MC,MD,MX,DB,KA,KL,TF]
 		MRA EXPERIMENTAL
 		MRA .LISP.
 ]	;END OF IFN ITS