diff --git a/sh/fs.sh b/sh/fs.sh
index 0db5696..26b11c7 100644
--- a/sh/fs.sh
+++ b/sh/fs.sh
@@ -1,3 +1,7 @@
+# ╭────╮
+# │ fs │
+# ╰────╯
+
 rwx_fs_make_btrfs() {
 	local device="${1}"
 	local label="${2}"
diff --git a/sh/main.sh b/sh/main.sh
index 802418f..40fbf17 100755
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -84,12 +84,14 @@ rwx_find_shell() {
 # │ main │ ifs │
 # ╰──────┴─────╯
 
+# set internal field separator to line feed
 rwx_ifs_set() {
 	_RWX_IFS="${IFS}"
 	IFS="
 "
 }
 
+# unset internal field separator
 rwx_ifs_unset() {
 	IFS="${_RWX_IFS}"
 	unset RWX_IFS
@@ -99,6 +101,7 @@ rwx_ifs_unset() {
 # │ main │ source │
 # ╰──────┴────────╯
 
+# source code from file path
 rwx_source() {
 	local path="${1}"
 	[ -d "${path}" ] ||
diff --git a/sh/self.sh b/sh/self.sh
index 732e9c2..0a8f33e 100644
--- a/sh/self.sh
+++ b/sh/self.sh
@@ -92,7 +92,7 @@ rwx_self_init() {
 _rwx_cmd_rwx_install() { rwx_self_install "${@}"; }
 rwx_self_install() {
 	local target="${1}"
-	local command file root
+	local command file name root
 	# code
 	if [ -n "${target}" ]; then
 		root="${target}${RWX_ROOT_SYSTEM}"
@@ -101,10 +101,14 @@ rwx_self_install() {
 	fi
 	# commands
 	root="${target}/usr/local/bin"
+	name="${RWX_SELF_NAME}.sh"
+	file="${root}/${name}"
+	rwx_remove "${file}"
+	rwx_link "${file}" "${RWX_MAIN_PATH}"
 	for command in $(rwx_self_commands); do
 		file="${root}/${command}"
 		rwx_remove "${file}"
-		rwx_link "${file}" "${RWX_MAIN_PATH}"
+		rwx_link "${file}" "${name}"
 	done
 	# sh
 	file="${target}/etc/profile.d/${RWX_SELF_NAME}.sh"