diff --git a/src/uxnlin.tal b/src/uxnlin.tal
index 3c6169d..f3d9a0c 100644
--- a/src/uxnlin.tal
+++ b/src/uxnlin.tal
@@ -369,6 +369,7 @@ JMP2r
 @eagerstack "Eager-stack $1 ( arithmetic performed before stashing )
 @tokenlen "Token-length $1 ( token is longer than 24 characters )
 @combine "Combine $1 ( sequences of two literal bytes )
+@tailcall "Split-Tail $1 ( potential tail-call optimisation )
 
 @inc "INC $1 @inc2 "INC2 $1
 @inc-twice "INC 20 "INC $1
@@ -654,5 +655,9 @@ JMP2r
 	"STH2 $1 "SWP2  $1 "STH2r $1 =rot2swp2
 	"#80 $1 "SFT2 $1 "POP $1 =nip
 	"#08 $1 "SFT2 $1 "NIP $1 =pop
+	"JSR2 $1 "POP2 $1 "JMP2r $1 =tailcall
+	"JSR2 $1 "POP $1 "JMP2r $1 =tailcall
+	"JSR $1 "POP2 $1 "JMP2r $1 =tailcall
+	"JSR $1 "POP $1 "JMP2r $1 =tailcall
 
 &end