diff --git a/configure.ac b/configure.ac
index 4f9b88236..c37abfcd5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -364,7 +364,7 @@ PKG_CHECK_MODULES(LIBOIL, [ liboil-0.3 >= 0.3.0 ])
 AC_SUBST(LIBOIL_CFLAGS)
 AC_SUBST(LIBOIL_LIBS)
 
-### JACK ####
+### JACK (optional) ####
 
 PKG_CHECK_MODULES(JACK, [ jack >= 0.100 ], HAVE_JACK=1, HAVE_JACK=0)
 AC_SUBST(JACK_CFLAGS)