diff --git a/Makefile b/Makefile
index fd72780ada584a522eeec7890fdb8bd97d61adc7..469c2cf13dfacb76ead197e67fbf8546a71fe6e8 100644
--- a/Makefile
+++ b/Makefile
@@ -10,3 +10,5 @@ BATCHFLAGS = -batch -q --no-site-file
 
 test:
 	${EMACS} -L src $(BATCHFLAGS) -f batch-byte-compile $(TEST_DIR)/*.el
+# wg-mode-line-string
+	${EMACS} -L src -batch -l workgroups-functions.el --eval '(message (wg-mode-line-string))'