diff --git a/.gitmodules b/.gitmodules
index 6e920b0a..d6c82002 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -43,3 +43,6 @@
 [submodule "tools/cbridge"]
 	path = tools/cbridge
 	url = https://github.com/bictorv/chaosnet-bridge
+[submodule "tools/chaosnet-tools"]
+	path = tools/chaosnet-tools
+	url = https://github.com/Chaosnet/chaosnet-tools
diff --git a/Makefile b/Makefile
index a6fd185c..b1b92d39 100644
--- a/Makefile
+++ b/Makefile
@@ -71,7 +71,7 @@ BINIGNORE=-e '^(ka10|kl10|ks10|minsys)$$'
 SRCIGNORE=-e '^(system|midas)$$'
 
 SUBMODULES = dasm itstar klh10 mldev simh sims supdup cbridge \
-	tapeutils tv11 pdp6 vt05 tek4010
+	tapeutils tv11 pdp6 vt05 tek4010 chaosnet-tools
 
 # These files are used to create bootable tape images.
 RAM = bin/ks10/boot/ram.262
@@ -105,7 +105,8 @@ SMF:=$(addprefix tools/,$(addsuffix /.gitignore,$(SUBMODULES)))
 OUT=out/$(EMULATOR)
 
 all: its $(OUT)/stamp/test $(OUT)/stamp/emulators \
-	tools/supdup/supdup tools/cbridge/cbridge
+	tools/supdup/supdup tools/cbridge/cbridge \
+	tools/chaosnet-tools/shutdown
 
 its: $(SMF) $(OUT)/stamp/its
 
@@ -406,6 +407,9 @@ tools/supdup/supdup:
 tools/cbridge/cbridge:
 	$(MAKE) -C tools/cbridge
 
+tools/chaosnet-tools/shutdown:
+	$(MAKE) -C tools/chaosnet-tools
+
 $(SMF):
 	$(GIT) submodule sync --recursive `dirname $@`
 	$(GIT) submodule update --recursive --init `dirname $@`
diff --git a/tools/chaosnet-tools b/tools/chaosnet-tools
new file mode 160000
index 00000000..527c02a4
--- /dev/null
+++ b/tools/chaosnet-tools
@@ -0,0 +1 @@
+Subproject commit 527c02a4f41a8495e12ca32bcb4a0117575b8a8c