diff --git a/sys/src/cmd/cmds.json b/sys/src/cmd/cmds.json
index 0072653..2194b31 100644
--- a/sys/src/cmd/cmds.json
+++ b/sys/src/cmd/cmds.json
@@ -37,7 +37,6 @@
 			"mtime.c",
 			"mv.c",
 			"netstat.c",
-			"ns.c",
 			"p.c",
 			"pipefile.c",
 			"ps.c",
@@ -105,6 +104,7 @@
 			"hjfs/",
 			"hoc/",
 			"ndb/",
+			"ns/",
 			"rc/",
 			"rio/",
 			"sam/",
diff --git a/sys/src/cmd/ns/build.json b/sys/src/cmd/ns/build.json
new file mode 100644
index 0000000..5a44108
--- /dev/null
+++ b/sys/src/cmd/ns/build.json
@@ -0,0 +1,11 @@
+{
+	"ns": {
+		"Include": [
+			"../cmd.json"
+		],
+		"Install": "/arch/$ARCH/cmd/ns/",
+		"SourceFilesCmd": [
+			"cat.c"
+		]
+	}
+}
diff --git a/sys/src/cmd/ns.c b/sys/src/cmd/ns/cat.c
similarity index 98%
rename from sys/src/cmd/ns.c
rename to sys/src/cmd/ns/cat.c
index 538bd17..c0a5d37 100644
--- a/sys/src/cmd/ns.c
+++ b/sys/src/cmd/ns/cat.c
@@ -38,7 +38,7 @@ int	rflag;
 void
 usage(void)
 {
-	fprint(2, "usage: ns [-r] [pid]\n");
+	fprint(2, "usage: ns/cat [-r] [pid]\n");
 	exits("usage");
 }