diff --git a/.gitmodules b/.gitmodules
index f7f04bf..8ca1a0a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -40,3 +40,6 @@
 [submodule "filesystem/ui"]
 	path = filesystem/ui
 	url = https://github.com/redox-os/orbdata.git
+[submodule "programs/acid"]
+	path = programs/acid
+	url = https://github.com/redox-os/acid.git
diff --git a/Makefile b/Makefile
index 19de26e..76afcf5 100644
--- a/Makefile
+++ b/Makefile
@@ -233,6 +233,9 @@ filesystem/bin/%: programs/%/Cargo.toml programs/%/src/** $(BUILD)/libstd.rlib
 	strip $@
 	rm $@.d
 
+filesystem/bin/sh: filesystem/bin/ion
+	cp $< $@
+
 filesystem/bin/%: programs/coreutils/Cargo.toml programs/coreutils/src/bin/%.rs $(BUILD)/libstd.rlib
 	mkdir -p filesystem/bin
 	$(CARGO) rustc --manifest-path $< --bin $* $(CARGOFLAGS) -o $@
@@ -359,7 +362,9 @@ $(BUILD)/filesystem.bin: \
 		orbutils \
 		userutils \
 		schemes \
+		filesystem/bin/acid \
 		filesystem/bin/ion \
+		filesystem/bin/sh \
 		filesystem/bin/smith
 	rm -rf $@ $(BUILD)/filesystem/
 	echo exit | cargo run --manifest-path schemes/redoxfs/Cargo.toml --bin redoxfs-utility $@ 64
diff --git a/programs/acid b/programs/acid
new file mode 160000
index 0000000..e38c225
--- /dev/null
+++ b/programs/acid
@@ -0,0 +1 @@
+Subproject commit e38c225aab948f92444f904a9116ff9574c05954