diff --git a/Makefile b/Makefile
index af3f65f..35b923d 100644
--- a/Makefile
+++ b/Makefile
@@ -12,7 +12,7 @@ touch:
 
 ext-js:
 		@@mkdir -p public/ext-js; mkdir -p public/ext-js/4-2;
-		@@jsduck -o ${EXTJS_PUBLIC} --welcome=${EXTJS_SRC}welcome.html --config=config.json
+		@@jsduck -o ${EXTJS_PUBLIC} --welcome=${EXTJS_SRC}welcome.html --config=config.json --guides=${EXTJS_SRC}guides.json
 		@@echo JSDuck Build. source ${EXTJS_SRC} to public ${EXTJS_PUBLIC}
 
 all: touch ext-js
diff --git a/src/ext-js/4-2/guides.json b/src/ext-js/4-2/guides.json
new file mode 100644
index 0000000..a36c6fa
--- /dev/null
+++ b/src/ext-js/4-2/guides.json
@@ -0,0 +1,12 @@
+[
+    {
+        "title": "CodeReading",
+        "items": [
+            {
+                "title": "Ext.js",
+                "name": "ext",
+                "description": "core/Ext.js"
+            }
+        ]
+    }
+]
diff --git a/src/ext-js/4-2/guides/ext/README.md b/src/ext-js/4-2/guides/ext/README.md
new file mode 100644
index 0000000..d93cde3
--- /dev/null
+++ b/src/ext-js/4-2/guides/ext/README.md
@@ -0,0 +1,58 @@
+# core/Ext.js
+
+### Ext 名前空間の作成
+
+### Ext.apply
+
+コンフィグオプションを反映させる時に利用する重要メソッド
+
+### Ext.emptyFn
+
+### Ext.applyIf
+
+### Ext.iterate
+
+### Ext.iterate
+
+### Ext.extend
+
+deprecated
+
+### Ext.override
+
+deprecated
+
+### Ext.valueFrom
+
+### Ext.typeOf
+
+### Ext.isEmpty
+
+### 判定用メソッド
+
+- isArray
+- isDate
+- isMSDate
+- isObject
+- isPrimitive
+- isFunction
+- isNumber
+- isNumeric
+- isString
+- isBoolean
+- isElement
+- isTextNode
+- isDefined
+- isIterable
+
+### Ext.clone
+
+### Ext.typeOf のエイリアス Ext.type を定義
+
+後方互換性のため
+
+### Ext.app
+
+### Ext.globalEval
+
+touch だと private 扱い