diff --git a/Makefile b/Makefile
index b74d1b5..4f5e5b6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-SUBDIRS = examples molecule
+SUBDIRS = examples molecule po
 PREFIX = /usr
 BINDIR = $(PREFIX)/bin
 DESTDIR = 
@@ -15,4 +15,4 @@ install:
 	for d in $(SUBDIRS); do make -C $$d install; done
 	# install the application
 	mkdir -p $(DESTDIR)$(BINDIR)
-	install -m 755 molecule.py $(DESTDIR)$(BINDIR)/molecule
\ No newline at end of file
+	install -m 755 molecule.py $(DESTDIR)$(BINDIR)/molecule