diff --git a/sh/file.sh b/sh/file.sh
new file mode 100644
index 0000000..becca76
--- /dev/null
+++ b/sh/file.sh
@@ -0,0 +1,26 @@
+# ╭──────╮
+# │ file │
+# ╰──────╯
+
+rwx_file_append() {
+	local file="${1}"
+	local text="${2}"
+	if [ -n "${file}" ]; then
+		printf "%s" "${text}" >>"${file}"
+	fi
+}
+
+rwx_file_empty() {
+	local file="${1}"
+	if [ -n "${file}" ]; then
+		rwx_file_write "${file}" ""
+	fi
+}
+
+rwx_file_write() {
+	local file="${1}"
+	local text="${2}"
+	if [ -n "${file}" ]; then
+		printf "%s" "${text}" >"${file}"
+	fi
+}
diff --git a/sh/main.sh b/sh/main.sh
index 40fbf17..78c7677 100755
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -1,5 +1,9 @@
 #! /usr/bin/env sh
 
+# ╭──────╮
+# │ main │
+# ╰──────╯
+
 # ╭──────┬───────────╮
 # │ main │ constants │
 # ╰──────┴───────────╯
@@ -127,12 +131,12 @@ rwx_source() {
 
 # run initial steps
 rwx_main() {
-	# system root
+	# source system root
 	if ! rwx_source "${RWX_ROOT_SYSTEM}"; then
 		__rwx_log "Not a directory: ${RWX_ROOT_SYSTEM}"
 		return 1
 	fi
-	# user root
+	# source user root
 	rwx_source "${RWX_SELF_USER}"
 	# context / command
 	if [ -n "${RWX_COMMAND_NAME}" ]; then
diff --git a/sh/tmux.sh b/sh/tmux.sh
index 0294e7f..a29ec26 100644
--- a/sh/tmux.sh
+++ b/sh/tmux.sh
@@ -1,3 +1,7 @@
+# ╭──────╮
+# │ tmux │
+# ╰──────╯
+
 # ╭──────┬───────╮
 # │ tmux │ setup │
 # ╰──────┴───────╯
diff --git a/sh/util.sh b/sh/util.sh
index cbcd67a..a3c53bf 100644
--- a/sh/util.sh
+++ b/sh/util.sh
@@ -1,25 +1,6 @@
-rwx_file_append() {
-	local file="${1}"
-	local text="${2}"
-	if [ -n "${file}" ]; then
-		printf "%s" "${text}" >>"${file}"
-	fi
-}
-
-rwx_file_empty() {
-	local file="${1}"
-	if [ -n "${file}" ]; then
-		rwx_file_write "${file}" ""
-	fi
-}
-
-rwx_file_write() {
-	local file="${1}"
-	local text="${2}"
-	if [ -n "${file}" ]; then
-		printf "%s" "${text}" >"${file}"
-	fi
-}
+# ╭──────╮
+# │ util │
+# ╰──────╯
 
 rwx_link() {
 	local link="${1}"