diff --git a/src/locale.sh b/src/locale.sh
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+#!/usr/bin/env bash
+
+# === Motivation ===
+# Configure system locale, timezone, and keyboard layout for international users.
+
+# === Problem Statement ===
+# A freshly installed system needs localization configuration to support user language and region.
+
+# === Scope ===
+# In scope: locale generation, timezone configuration, keyboard layout.
+# Out of scope: X11 keyboard configuration, font selection, language packs.
+
+# === Concepts ===
+# Locale: Defines language, character encoding, and formatting conventions (LC_*).
+# Timezone: Maps local time to UTC with regional rules (DST, etc.).
+# Keyboard layout: Console keymap for character input.
+
+# === Decisions ===
+# Default locale is en_US.UTF-8 for broadest compatibility.
+# Default timezone will be configured based on user prompt (see config.sh).
+# Default keyboard layout is 'us' (can be overridden via config).
+# Use /etc/default/libc-locales for locale configuration (Void standard).
+# Use symlink for timezone (/etc/localtime → /usr/share/zoneinfo/<zone>).
+# Use /etc/rc.conf for console keyboard layout (KEYMAP variable).
+
+# === Alternatives Considered ===
+# systemd-localed rejected (Void uses runit).
+# Generating all locales rejected (wastes disk space and time).
+# Auto-detection of timezone rejected (unreliable without network/GeoIP).
+
+# === Constraints ===
+# Target system must be mounted at $MOUNT_ROOT.
+# Locale must be generated before it can be used.
+# Timezone must exist in /usr/share/zoneinfo.
+
+# === Open Questions ===
+# Should we support multiple locales (e.g., en_US + de_DE)?
+# Should we validate timezone path before creating symlink?
+# Should we configure X11 keyboard layout as well?
+
+# === Success Criteria ===
+# Locale is generated and available in the installed system.
+# Timezone is correctly configured and persists after reboot.
+# Keyboard layout matches user selection on console login.
+
+locale_configure() {
+  : "${MOUNT_ROOT:?Mount root is required}"
+  : "${LOCALE:?Locale is required}"
+  : "${TIMEZONE:?Timezone is required}"
+  : "${KEYBOARD:?Keyboard layout is required}"
+
+  log_info "Locale configuration: setting up locale, timezone, and keyboard"
+
+  # Configure locale in /etc/default/libc-locales
+  log_info "Configuring locale: $LOCALE"
+  local locale_file="$MOUNT_ROOT/etc/default/libc-locales"
+  mkdir -p "$(dirname "$locale_file")"
+
+  # Ensure locale file exists
+  if [[ ! -f "$locale_file" ]]; then
+    touch "$locale_file"
+  fi
+
+  # Uncomment or add the selected locale
+  if grep -q "^#${LOCALE}" "$locale_file"; then
+    # Locale exists but is commented - uncomment it
+    sed -i "s/^#${LOCALE}/${LOCALE}/" "$locale_file"
+  elif grep -q "^${LOCALE}" "$locale_file"; then
+    # Locale already enabled
+    log_info "Locale $LOCALE already enabled"
+  else
+    # Add locale to file
+    echo "$LOCALE UTF-8" >> "$locale_file"
+  fi
+
+  # Generate locales
+  log_info "Generating locales (this may take a moment)..."
+  if ! chroot "$MOUNT_ROOT" xbps-reconfigure -f glibc-locales; then
+    log_warn "Failed to reconfigure glibc-locales, but continuing"
+  fi
+
+  # Configure timezone
+  log_info "Configuring timezone: $TIMEZONE"
+  local timezone_source="/usr/share/zoneinfo/$TIMEZONE"
+  local timezone_target="$MOUNT_ROOT/etc/localtime"
+
+  if [[ ! -f "$MOUNT_ROOT$timezone_source" ]]; then
+    log_warn "Timezone file not found: $timezone_source - using UTC as fallback"
+    TIMEZONE="UTC"
+    timezone_source="/usr/share/zoneinfo/UTC"
+  fi
+
+  # Remove existing symlink or file
+  rm -f "$timezone_target"
+
+  # Create symlink
+  ln -sf "$timezone_source" "$timezone_target"
+
+  # Also set timezone in /etc/timezone for compatibility
+  echo "$TIMEZONE" > "$MOUNT_ROOT/etc/timezone"
+
+  # Configure keyboard layout
+  log_info "Configuring keyboard layout: $KEYBOARD"
+  local rc_conf="$MOUNT_ROOT/etc/rc.conf"
+
+  mkdir -p "$(dirname "$rc_conf")"
+  touch "$rc_conf"
+
+  # Update or add KEYMAP entry in /etc/rc.conf
+  if grep -q "^KEYMAP=" "$rc_conf"; then
+    sed -i "s/^KEYMAP=.*/KEYMAP=\"$KEYBOARD\"/" "$rc_conf"
+  else
+    echo "KEYMAP=\"$KEYBOARD\"" >> "$rc_conf"
+  fi
+
+  log_info "Locale configuration complete."
+}