diff --git a/.env.example b/.env.example
index a4f4571..de1ee8f 100644
--- a/.env.example
+++ b/.env.example
@@ -1,13 +1,21 @@
 # 뇌사료(Brain Dogfood) Environment Variables Template
 
-# Flask Security
+# Flask Security (Required)
 SECRET_KEY=your_super_secret_key_here
 SESSION_LIFETIME_DAYS=30
 
-# Authentication
+# Content Encryption (Required for Encrypted Memos)
+# Set a unique long string as a seed for Fernet key generation
+ENCRYPTION_SEED=your_encryption_seed_here
+
+# Authentication (Required for Login)
 ADMIN_USERNAME=admin
 ADMIN_PASSWORD=admin
 
 # AI Features (Optional)
 GEMINI_API_KEY=your_google_gemini_api_key_here
 GEMINI_MODEL=gemini-1.5-flash
+
+# API Integration (Optional)
+# For Obsidian Plugin or external tools
+OBSIDIAN_API_TOKEN=your_secret_token_here
diff --git a/config.example.json b/config.example.json
index 32b6ba0..985c901 100644
--- a/config.example.json
+++ b/config.example.json
@@ -4,6 +4,25 @@
     "card_color": "rgba(30, 41, 59, 0.85)",
     "encrypted_border": "#00f3ff",
     "ai_accent": "#8b5cf6",
+    "lang": "en",
     "enable_ai": false,
-    "lang": "en"
+    "enable_categories": false,
+    "categories": [
+        "Personal",
+        "Work",
+        "Idea"
+    ],
+    "pinned_categories": [
+        "Personal"
+    ],
+    "upload_security": {
+        "allowed_extensions": [
+            "png", "jpg", "jpeg", "gif", "webp", "svg",
+            "pdf", "doc", "docx", "xls", "xlsx", "ppt", "pptx",
+            "zip", "rar", "7z", "txt", "md"
+        ],
+        "blocked_extensions": [
+            "exe", "bat", "cmd", "sh", "ps1", "vbs", "js", "php", "py"
+        ]
+    }
 }