diff --git a/build/misc.tcl b/build/misc.tcl
index 0fc5d4d7..4313acb6 100644
--- a/build/misc.tcl
+++ b/build/misc.tcl
@@ -1281,6 +1281,10 @@ respond "DSK: SYS; TS NTJ6" "\r"
 respond "*" ":kill\r"
 respond "*" ":link sys; ts tj6, sys; ts ntj6\r"
 
+# Old TJ6.
+respond "*" ":midas sys2; ts otj6_tj6; otj6\r"
+expect ":KILL"
+
 # OINIT
 respond "*" ":cwd c\r"
 respond "*" ":cc sysen2/oinit\r"
diff --git a/doc/programs.md b/doc/programs.md
index 015c8a9b..3f9779eb 100644
--- a/doc/programs.md
+++ b/doc/programs.md
@@ -216,6 +216,7 @@
 - OINIT, init program reporting last login, email.
 - OS, realtime TTY spy.
 - OTHELLO, the original Othello game -- simpler than Go.
+- OTJ6, an old version of TJ6.
 - PALX, PDP-11 cross assembler.
 - PANDA, user account management program.
 - PAPSAV, daemon to record system events in file system.
diff --git a/src/syseng/tj6.138 b/src/tj6/otj6.138
similarity index 100%
rename from src/syseng/tj6.138
rename to src/tj6/otj6.138