diff --git a/.devcontainer/setup.sh b/.devcontainer/setup.sh
index 2732761..71fce97 100755
--- a/.devcontainer/setup.sh
+++ b/.devcontainer/setup.sh
@@ -6,30 +6,30 @@ PLATFORM=$(uname -m)
 readonly PLATFORM
 readonly GIT_HOOKS_PATH='.githooks'
 
-# 1. 필수 환경 변수 검증
+# 1. Validate required environment variables
 if [[ -z "${SUPER_LINTER_TAG:-}" ]]; then
     echo 'SUPER_LINTER_TAG is required.'
     exit 1
 fi
 
-# 2. nvm 로드
+# 2. Load nvm
 export NVM_DIR="/usr/local/share/nvm"
 if [ -s "$NVM_DIR/nvm.sh" ]; then
     # shellcheck disable=SC1091
     \. "$NVM_DIR/nvm.sh" || true
 fi
 
-# 3. .nvmrc 기준으로 Node 버전 설치 및 활성화
+# 3. Install and activate the Node version specified in .nvmrc
 if [ -f .nvmrc ]; then
     nvm install
     nvm use
 fi
 
-# 4. Corepack 활성화 & 최신 npm 11.x 버전 설치
+# 4. Enable Corepack and install the latest npm 11.x version
 sudo corepack enable npm
 corepack prepare npm@11 --activate
 
-# 5. 버전 확인
+# 5. Check versions
 echo "==================================================="
 echo "npm version: $(npm --version)"
 echo "node version: $(node --version)"
@@ -38,14 +38,14 @@ echo "Platform detected: $PLATFORM"
 echo "super-linter tag: $SUPER_LINTER_TAG"
 echo "==================================================="
 
-# 6. 저장소 git hook 경로 설정
+# 6. Configure the repository Git hooks path
 if git rev-parse --show-toplevel > /dev/null 2>&1; then
     git config --local core.hooksPath "$GIT_HOOKS_PATH"
     chmod +x "${GIT_HOOKS_PATH}/pre-push"
     echo "git hooks path: $(git config --local core.hooksPath)"
 fi
 
-# 7. super-linter 이미지 다운로드
+# 7. Download the super-linter image
 docker pull \
     --platform linux/amd64 \
     "ghcr.io/super-linter/super-linter:$SUPER_LINTER_TAG"
diff --git a/.vscode/launch.json b/.vscode/launch.json
index 2c3bc9b..74a49a4 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -19,7 +19,7 @@
       "runtimeExecutable": "npx",
       "runtimeArgs": [
         "jest",
-        "--runInBand", // 병렬 실행 막고 디버깅 안정화
+        "--runInBand", // Run tests serially in a single process for easier debugging
         "--watchAll=false"
       ],
       "args": [],
diff --git a/docs/configuration-guide.ko.md b/docs/configuration-guide.ko.md
index cf2c5c4..8a49dfb 100644
--- a/docs/configuration-guide.ko.md
+++ b/docs/configuration-guide.ko.md
@@ -1,5 +1,7 @@
 # 설정 파일 가이드
 
+[English](/docs/configuration-guide.md) | 한국어
+
 이 문서는 설정 파일의 구조와 작성 방법을 설명합니다. 설정 파일은 `.github` 디렉터리에 위치합니다.
 
 <br>
diff --git a/docs/configuration-guide.md b/docs/configuration-guide.md
index f6cf08a..ec72266 100644
--- a/docs/configuration-guide.md
+++ b/docs/configuration-guide.md
@@ -1,5 +1,7 @@
 # Configuration Guide
 
+English | [한국어](/docs/configuration-guide.ko.md)
+
 This document explains the structure of the configuration file and how to write it. The configuration file is located in
 the `.github` directory.
 
diff --git a/docs/dev/policy-rule-evaluation.ko.md b/docs/dev/policy-rule-evaluation.ko.md
index f9821b5..b57cc50 100644
--- a/docs/dev/policy-rule-evaluation.ko.md
+++ b/docs/dev/policy-rule-evaluation.ko.md
@@ -1,5 +1,7 @@
 # 규칙 평가 정책
 
+[English](/docs/dev/policy-rule-evaluation.md) | 한국어
+
 평가 단계는 설정 파일에 작성된 규칙(`Rule`)들을 평가하여 레이블을 추가해야 할지, 제거해야 할지, 유지해야 할지를
 결정한다.
 
diff --git a/docs/dev/policy-rule-evaluation.md b/docs/dev/policy-rule-evaluation.md
index 2af6540..b229085 100644
--- a/docs/dev/policy-rule-evaluation.md
+++ b/docs/dev/policy-rule-evaluation.md
@@ -1,5 +1,7 @@
 # Rule Evaluation Policy
 
+English | [한국어](/docs/dev/policy-rule-evaluation.ko.md)
+
 The evaluation step evaluates the configured rules (`Rule`) and determines whether each label should be added, removed,
 or kept.