diff --git a/README.md b/README.md
index 05bfe585..4ca3b7f5 100644
--- a/README.md
+++ b/README.md
@@ -183,6 +183,7 @@ A list of [known ITS machines](doc/machines.md).
    - NAME, Shows logged in users and locations, aka FINGER.
    - NETIME, network time dragon.
    - NICNAM/NICWHO, look up someone in the ARPAnet directory.
+   - NUDIR, create user directory.
    - NWATCH, small watch display.
    - OBS, observe system activities.
    - OS, realtime TTY spy.
diff --git a/build/build.tcl b/build/build.tcl
index 35474400..7a2131e1 100644
--- a/build/build.tcl
+++ b/build/build.tcl
@@ -1179,6 +1179,10 @@ respond "*" "nlinks+14/ A,,646471\r"
 type ":pdump sys1;ts prufd\r"
 respond "*" ":kill\r"
 
+# udir
+respond "*" ":midas sys3;ts nudir_sysen3; nudir\r"
+expect ":KILL"
+
 # STY
 respond "*" ":midas sys1;ts sty_sysen2;sty\r"
 expect ":KILL"
diff --git a/src/sysen3/nudir.1 b/src/sysen3/nudir.1
new file mode 100644
index 00000000..7e5112ad
--- /dev/null
+++ b/src/sysen3/nudir.1
@@ -0,0 +1,94 @@
+TITLE NUDIR - new user directory
+
+a=1
+b=2
+c=3
+d=4
+
+chn==5
+
+sname:	0
+uname:	0
+
+go:	.break 12,[..rjcl,,jcl] 
+
+	move a,jcl
+	cain a,0		;Empty JCL?
+	 jrst usage
+	camn a,[15_29.]		;Just a CR
+	 jrst usage
+
+	move a,[-6,,0]		;Convert JCL to sixbit
+	move b,[440700,,jcl]
+	move c,[440600,,sname]
+loop:	ildb d,b
+	caig d,40
+	 movei d,40		;Control characters to space
+	cail d,140
+	 subi d,40		;Lower case to upper
+	subi d,40
+	idpb d,c
+	aobjn a,loop
+
+	.call [setz		;Create directory
+		sixbit /open/
+		[.uai,,chn]
+		[sixbit /dsk/]
+		[sixbit /..new./]
+		[sixbit /(udir)/]
+		sname
+		%clerr,,a ((setz))]
+	 jrst [caie a,%ensfl
+		.lose
+		jrst .+1]
+	.close chn,
+
+	.call [setz		;Create -READ- -THIS- file
+		sixbit /open/
+		[.uao,,chn]
+		[sixbit /dsk/]
+		[sixbit /-read-/]
+		[sixbit /-this-/]
+		sname ((setz))]
+	 .lose
+
+	move a,[440700,,[ascii /Created by /]]
+	movei b,11.
+	.call [setz
+		sixbit /siot/
+		movei chn
+		move a
+		setz b]
+	 .lose
+
+	.suset [.rxuna,,a]	;Record which user created the directory
+uout:	move b,a
+	lsh b,-30.
+	addi b,40
+	.iot chn,b
+	lsh a,6
+	jumpn a,uout
+
+done:	.close chn,
+	.logout 1,
+
+usage:	.call [setz
+		sixbit /open/
+		move [.uao,,chn]
+		setz [sixbit /tty/]]
+	 .lose
+
+	move a,[440700,,[ascii /Usage: :UDIR <name>/]]
+	movei b,19.
+	.call [setz
+		sixbit /siot/
+		movei chn
+		move a
+		setz b]
+	 .lose
+
+	jrst done
+
+jcl:	block 10
+
+end go