diff --git a/configure.ac b/configure.ac
index 964fc5b313dd..2796015ece11 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1077,7 +1077,8 @@ AC_ARG_ENABLE(gtk,
 
 AC_ARG_ENABLE(gtk3,
     AS_HELP_STRING([--enable-gtk3],
-        [Determines whether to use Gtk+ 3.0 vclplug on platforms where Gtk+ 3.0 is available.]),
+        [Determines whether to use Gtk+ 3.0 vclplug on platforms where Gtk+ 3.0 is available.
+         This is experimental and may not work.]),
 ,enable_gtk3=no)
 
 AC_ARG_ENABLE(systray,