diff --git a/sh/lint/shellcheck.sh b/sh/lint/shellcheck.sh
index 0253062..c6aabb6 100644
--- a/sh/lint/shellcheck.sh
+++ b/sh/lint/shellcheck.sh
@@ -2,7 +2,7 @@ rwx_shellcheck() {
 	local root="${1}"
 	local file module modules path
 	file="$(mktemp)"
-	modules="$(rwx_find_shell "${root}")"
+	modules="$(rwx_main_find "${root}")"
 	while IFS= read -r module; do
 		path="${root}/${module}"
 		echo ". \"${path}\"" >>"${file}"
diff --git a/sh/main.sh b/sh/main.sh
index a8d1321..4910ba8 100755
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -28,16 +28,15 @@ RWX_ROOT_SYSTEM="/usr/local/lib/${RWX_SELF_NAME}"
 # │ main │ find │
 # ╰──────┴──────╯
 
-# find directory’s files by extension
+# find directory’s shell files
 #| find
 #| sort
-rwx_find_extension() {
-	local extension="${1}"
-	local root="${2}"
-	local file="${3}"
+rwx_main_find() {
+	local root="${1}"
+	local file="${2}"
 	set -- \
 		"${root}" \
-		-name "*.${extension}" \
+		-name "*.sh" \
 		-type "f"
 	[ -n "${file}" ] &&
 		set -- "${@}" \
@@ -48,11 +47,6 @@ rwx_find_extension() {
 		sort
 }
 
-# find directory’s sh files
-rwx_find_shell() {
-	rwx_find_extension "sh" "${@}"
-}
-
 # ╭──────┬───────╮
 # │ main │ shell │
 # ╰──────┴───────╯
@@ -93,7 +87,7 @@ rwx_main_source() {
 	count=0
 	_rwx_main_log "" \
 		". ${root}"
-	modules="$(rwx_find_shell "${root}" "${file}")"
+	modules="$(rwx_main_find "${root}" "${file}")"
 	while IFS= read -r module; do
 		count=$((count + 1))
 		_rwx_main_log "$(printf "%02d" "${count}") ${module%.sh}"
diff --git a/sh/self.sh b/sh/self.sh
index 76424f3..a8a6dbf 100644
--- a/sh/self.sh
+++ b/sh/self.sh
@@ -14,7 +14,7 @@ rwx_self_subset() {
 		file="${argument}.sh"
 		if [ -d "${root}" ]; then
 			local file
-			for file in $(rwx_find_shell "${root}"); do
+			for file in $(rwx_main_find "${root}"); do
 				echo "${argument}/${file}"
 			done
 		elif [ -f "${RWX_ROOT_SYSTEM}/${file}" ]; then