diff --git a/Documentation/aoe/mkdevs.sh b/Documentation/aoe/mkdevs.sh
index 6ce7070..ec5a6de 100644
--- a/Documentation/aoe/mkdevs.sh
+++ b/Documentation/aoe/mkdevs.sh
@@ -5,6 +5,7 @@
 
 if test "$#" != "1"; then
 	echo "Usage: sh `basename $0` {dir}" 1>&2
+	echo "       n_partitions=16 sh `basename $0` {dir}" 1>&2
 	exit 1
 fi
 dir=$1