diff --git a/sh/doc.awk b/sh/doc.awk
deleted file mode 100644
index 68df6fa..0000000
--- a/sh/doc.awk
+++ /dev/null
@@ -1,77 +0,0 @@
-function append(line) {
-    if (doc) {
-        doc = doc "\n"
-    }
-    doc = doc line
-}
-
-function output(name) {
-    print name
-    print "↓"
-    print doc
-    exit
-}
-
-function reset() {
-    doc = ""
-}
-
-BEGIN {
-    RE_ANY = "(.*)"
-    RE_NAME = "([_A-Za-z][_0-9A-Za-z]*)"
-    RE_SPACE = "[[:space:]]"
-    RE_SPACES = RE_SPACE "*"
-
-    RE_BEGIN = "^"
-    RE_END = RE_SPACES "$"
-    RE_FUNC = RE_SPACES "\\(" RE_SPACES "\\)" RE_SPACES "{"
-
-    RE_ALIAS = RE_BEGIN "#\\(" RE_SPACES RE_NAME RE_END
-    RE_DOC = RE_BEGIN "#" RE_SPACE RE_ANY RE_END
-    RE_FUNCTION = RE_BEGIN RE_NAME RE_FUNC RE_END
-    RE_MODULE = RE_BEGIN "#." RE_SPACES RE_NAME RE_END
-    RE_SET = RE_BEGIN RE_NAME "=.*" RE_END
-    RE_SHEBANG = RE_BEGIN "#!" RE_SPACES RE_ANY RE_END
-
-    alias = 0
-    reset()
-    module = 0
-}
-
-{
-    if (match($0, RE_MODULE, m)) {
-        reset()
-        if (m[1] == target) {
-            module = 1
-        }
-    } else if (match($0, RE_SHEBANG, m)) {
-        append(m[1])
-    } else if (match($0, RE_DOC, m)) {
-        append(m[1])
-    } else if (match($0, RE_SET, m)) {
-        if (m[1] == target) {
-            output(m[1])
-        } else {
-            reset()
-        }
-    } else if (match($0, RE_ALIAS, m)) {
-        if (m[1] == target) {
-            alias = 1
-        }
-        append(m[1])
-    } else if (match($0, RE_FUNCTION, m)) {
-        if (alias) {
-            output(m[1])
-        } else if (m[1] == target) {
-            output(m[1])
-        } else {
-            reset()
-        }
-    } else {
-        if (module) {
-            output(target)
-        } else {
-            reset()
-        }
-    }
-}
diff --git a/sh/main.sh b/sh/main.sh
index d4ad2e2..343cbe3 100755
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -64,7 +64,6 @@ rwx_main() {
 # ╰──────┴───────╯
 
 # cache source code of a module
-# inside a global code variable
 rwx_cache() {
 	local root="${1}"
 	local module="${2}"
diff --git a/sh/self.sh b/sh/self.sh
index 169921a..c181112 100644
--- a/sh/self.sh
+++ b/sh/self.sh
@@ -1,17 +1,7 @@
-# self
-# module
+# self module
 
 # meta doc
 rwx_doc() {
-	local name="${1}"
-	[ -n "${name}" ] || return
-	printf "%s" "${RWX_CODE}" |
-		awk \
-			-f "${RWX_ROOT_SYSTEM}/doc.awk" \
-			-v target="${name}"
-}
-
-rwx_doc_old() {
 	local name="${1}"
 	[ -n "${name}" ] || return
 	local constant doc func line module