diff --git a/src/udev/udev.conf b/src/udev/udev.conf
index 47d1433002..0d812d4a65 100644
--- a/src/udev/udev.conf
+++ b/src/udev/udev.conf
@@ -1,3 +1,6 @@
 # see udev.conf(5) for details
+#
+# udevd is also started in the initrd.  When this file is modified you might
+# also want to rebuild the initrd, so that it will include the modified configuration.
 
 #udev_log="info"