diff --git a/share/man/man8/nanobsd.8 b/share/man/man8/nanobsd.8
--- a/share/man/man8/nanobsd.8
+++ b/share/man/man8/nanobsd.8
@@ -77,7 +77,7 @@
 .Cm buildworld
 stage and adds -DNO_CLEAN to the make command line
 used for each build stage (world and kernel).
-.It Fl r
+.It Fl p
 Don't prepare the image.
 Skip running of the customization and early customization scripts for
 incremental image refinement from world, kernel, or packages.
diff --git a/tools/tools/nanobsd/defaults.sh b/tools/tools/nanobsd/defaults.sh
--- a/tools/tools/nanobsd/defaults.sh
+++ b/tools/tools/nanobsd/defaults.sh
@@ -886,7 +886,7 @@
 
 usage ( ) {
 	(
-	echo "Usage: $0 [-BbfhIiKknqvWwX] [-c config_file]"
+	echo "Usage: $0 [-BbfhIiKknpqvWwX] [-c config_file]"
 	echo "	-B	suppress installs (both kernel and world)"
 	echo "	-b	suppress builds (both kernel and world)"
 	echo "	-c	specify config file"
@@ -897,6 +897,7 @@
 	echo "	-K	suppress installkernel"
 	echo "	-k	suppress buildkernel"
 	echo "	-n	add -DNO_CLEAN to buildworld, buildkernel, etc"
+	echo "	-p	suppress preparing the image"
 	echo "	-q	make output more quiet"
 	echo "	-v	make output more verbose"
 	echo "	-W	suppress installworld"