diff --git a/sh/main.sh b/sh/main.sh
index 9629b27..c7f34e4 100755
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -64,6 +64,9 @@ rwx_main() {
 # │ main │ cache │
 # ╰──────┴───────╯
 
+# cache of all sourced code modules
+_rwx_code=""
+
 # cache source code of a module
 # inside a global code variable
 rwx_cache() {
@@ -74,7 +77,7 @@ rwx_cache() {
 	local text
 	text="$(cat "${path}")"
 	# all source code
-	RWX_CODE="${RWX_CODE}\
+	_rwx_code="${_rwx_code}\
 #. ${name}
 ${text}
 "
@@ -187,11 +190,11 @@ rwx_parse_code() {
 	RWX_FUNCTIONS="$(rwx_parse_functions)"
 }
 rwx_parse_constants() {
-	printf "%s\n" "${RWX_CODE}" |
+	printf "%s\n" "${_rwx_code}" |
 		sed --silent "s|${RWX_REGEX_TARGET_CONSTANT}|\\1|p"
 }
 rwx_parse_functions() {
-	printf "%s\n" "${RWX_CODE}" |
+	printf "%s\n" "${_rwx_code}" |
 		sed --silent "s|${RWX_REGEX_TARGET_FUNCTION}|\\1|p"
 }
 
@@ -211,6 +214,8 @@ rwx_test() {
         \
         "RWX_MAIN_NAME" \
         \
+        "_rwx_code" \
+        \
         "rwx_cache" \
         \
         "gsc"
diff --git a/sh/self.sh b/sh/self.sh
index 169921a..cc10d56 100644
--- a/sh/self.sh
+++ b/sh/self.sh
@@ -5,7 +5,7 @@
 rwx_doc() {
 	local name="${1}"
 	[ -n "${name}" ] || return
-	printf "%s" "${RWX_CODE}" |
+	printf "%s" "${_rwx_code}" |
 		awk \
 			-f "${RWX_ROOT_SYSTEM}/doc.awk" \
 			-v target="${name}"
@@ -55,7 +55,7 @@ rwx_doc_old() {
 				;;
 		esac
 	done <<EOF
-${RWX_CODE}
+${_rwx_code}
 EOF
 }