diff --git a/sh/main.sh b/sh/main.sh
index cec9997..087c31b 100755
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -8,6 +8,7 @@
 # │ main │ constants │
 # ╰──────┴───────────╯
 
+# name of the entrypoint file
 RWX_MAIN_NAME="main.sh"
 RWX_SELF_NAME="rwx"
 
@@ -61,37 +62,22 @@ rwx_main() {
 # │ main │ cache │
 # ╰──────┴───────╯
 
+RWX_CODE=""
+
+# cache source code of a module
 rwx_cache() {
 	local root="${1}"
 	local module="${2}"
 	local name="${module%.sh}"
 	local path="${root}/${module}"
-	local fill text
-	fill="$(rwx_fill "${#name}" ─)"
+	local text
 	text="$(cat "${path}")"
-	[ -n "${RWX_CODE}" ] && RWX_CODE="${RWX_CODE}
-"
 	RWX_CODE="${RWX_CODE}\
-# ╭───┬────┬─${fill}─╮
-# │ ↙ │ sh │ ${name} │
-# ╰───┴────┴─${fill}─╯
-
+#↓ ${name}
 ${text}
 "
 }
 
-# ╭──────┬──────╮
-# │ main │ fill │
-# ╰──────┴──────╯
-
-rwx_fill() {
-	local index="${1}"
-	while [ "${index}" -gt 0 ]; do
-		printf "%s" "${2}"
-		index=$((index - 1))
-	done
-}
-
 # ╭──────┬────────╮
 # │ main │ source │
 # ╰──────┴────────╯
diff --git a/sh/self.sh b/sh/self.sh
index 0a8f33e..eb9822d 100644
--- a/sh/self.sh
+++ b/sh/self.sh
@@ -1,22 +1,50 @@
+# self module
+
 # meta doc
 rwx_doc() {
 	local name="${1}"
 	[ -n "${name}" ] || return
-	local doc line module
-	rwx_ifs_set
-	for module in $(rwx_find_shell "${RWX_ROOT_SYSTEM}"); do
-		while read -r line; do
-			case "${line}" in
-			"#"*) doc="${doc}${line}" ;;
-			"${name}() {")
-				echo "${doc}"
-				return
+	local constant doc func line module
+	printf "%s\n" "${RWX_CODE}" | while IFS= read -r line; do
+		case "${line}" in
+			"#!"*) doc="" ;;
+			"#↓"*)
+				doc=""
+				module="$(echo "${line}" | sed "s|#↓ \\(.*\\)|\\1|")"
 				;;
-			*) doc="" ;;
-			esac
-		done <"${RWX_ROOT_SYSTEM}/${module}"
+			"#"*)
+				[ -n "${doc}" ] && doc="${doc}
+"
+				doc="${doc}${line}"
+				;;
+			*"="*)
+				constant="$(echo "${line}" | sed "s|^\\(.*\\)=.*|\\1|")"
+				if [ "${constant}" = "${name}" ]; then
+					echo "${doc}"
+					return
+				else
+					doc=""
+				fi
+				;;
+			*"("*")"*"{"*)
+				func="$(echo "${line}" | sed "s|^\\(.*\\)() {.*|\\1|")"
+				if [ "${func}" = "${name}" ]; then
+					echo "${doc}"
+					return
+				else
+					doc=""
+				fi
+				;;
+			*)
+				if [ "${module}" = "${name}" ]; then
+					echo "${doc}"
+					return
+				else
+					doc=""
+				fi
+				;;
+		esac
 	done
-	rwx_ifs_unset
 }
 
 # ╭──────┬───────╮