diff --git a/webmagic-core/src/main/java/us/codecraft/webmagic/model/ExtractBy.java b/webmagic-core/src/main/java/us/codecraft/webmagic/model/ExtractBy.java
index 4c37c9b..661fd67 100644
--- a/webmagic-core/src/main/java/us/codecraft/webmagic/model/ExtractBy.java
+++ b/webmagic-core/src/main/java/us/codecraft/webmagic/model/ExtractBy.java
@@ -5,6 +5,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.Target;
 
 /**
+ * 定义类或者字段的抽取规则。<br>
  * @author code4crafter@gmail.com <br>
  * @date: 13-8-1 <br>
  * Time: 下午8:40 <br>
diff --git a/webmagic-core/src/main/java/us/codecraft/webmagic/model/ExtractByUrl.java b/webmagic-core/src/main/java/us/codecraft/webmagic/model/ExtractByUrl.java
index 9f77676..f443c0e 100644
--- a/webmagic-core/src/main/java/us/codecraft/webmagic/model/ExtractByUrl.java
+++ b/webmagic-core/src/main/java/us/codecraft/webmagic/model/ExtractByUrl.java
@@ -5,6 +5,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.Target;
 
 /**
+ * 定义类或者字段的抽取规则(从url中抽取，只支持正则表达式)。<br>
  * @author code4crafter@gmail.com <br>
  * @date: 13-8-1 <br>
  * Time: 下午8:40 <br>
diff --git a/webmagic-core/src/main/java/us/codecraft/webmagic/model/HelpUrl.java b/webmagic-core/src/main/java/us/codecraft/webmagic/model/HelpUrl.java
index 9dee05b..808d58a 100644
--- a/webmagic-core/src/main/java/us/codecraft/webmagic/model/HelpUrl.java
+++ b/webmagic-core/src/main/java/us/codecraft/webmagic/model/HelpUrl.java
@@ -5,6 +5,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.Target;
 
 /**
+ * 定义辅助爬取的url。<br>
  * @author code4crafter@gmail.com <br>
  * @date: 13-8-1 <br>
  * Time: 下午8:40 <br>
diff --git a/webmagic-core/src/main/java/us/codecraft/webmagic/model/TargetUrl.java b/webmagic-core/src/main/java/us/codecraft/webmagic/model/TargetUrl.java
index 96ca864..3622f55 100644
--- a/webmagic-core/src/main/java/us/codecraft/webmagic/model/TargetUrl.java
+++ b/webmagic-core/src/main/java/us/codecraft/webmagic/model/TargetUrl.java
@@ -5,6 +5,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.Target;
 
 /**
+ * 定义某个类抽取的范围和来源，sourceRegion可以用xpath语法限定抽取区域。<br>
  * @author code4crafter@gmail.com <br>
  * @date: 13-8-1 <br>
  * Time: 下午8:40 <br>
diff --git a/webmagic-core/src/main/java/us/codecraft/webmagic/utils/DoubleKeyMap.java b/webmagic-core/src/main/java/us/codecraft/webmagic/utils/DoubleKeyMap.java
index 500573a..a834528 100755
--- a/webmagic-core/src/main/java/us/codecraft/webmagic/utils/DoubleKeyMap.java
+++ b/webmagic-core/src/main/java/us/codecraft/webmagic/utils/DoubleKeyMap.java
@@ -3,7 +3,7 @@ package us.codecraft.webmagic.utils;
 import java.util.Map;
 
 /**
- * @author yihua.huang@dianping.com
+ * @author code4crafter@gmail.com
  * @date Dec 14, 2012
  */
 public class DoubleKeyMap<K1, K2, V> extends MultiKeyMapBase {
diff --git a/webmagic-core/src/main/java/us/codecraft/webmagic/utils/MultiKeyMapBase.java b/webmagic-core/src/main/java/us/codecraft/webmagic/utils/MultiKeyMapBase.java
index e0b5c64..256097a 100755
--- a/webmagic-core/src/main/java/us/codecraft/webmagic/utils/MultiKeyMapBase.java
+++ b/webmagic-core/src/main/java/us/codecraft/webmagic/utils/MultiKeyMapBase.java
@@ -1,7 +1,7 @@
 package us.codecraft.webmagic.utils;
 
 /**
- * @author yihua.huang@dianping.com
+ * @author code4crafter@gmail.com
  * @date Dec 14, 2012
  */
 
diff --git a/webmagic-samples/src/main/java/us/codecraft/webmagic/model/samples/News163.java b/webmagic-samples/src/main/java/us/codecraft/webmagic/model/samples/News163.java
index bf26930..07b1e8e 100644
--- a/webmagic-samples/src/main/java/us/codecraft/webmagic/model/samples/News163.java
+++ b/webmagic-samples/src/main/java/us/codecraft/webmagic/model/samples/News163.java
@@ -46,7 +46,7 @@ public class News163 implements PagedModel, AfterExtractor {
     @Override
     public String getPage() {
         if (page == null) {
-            return "0";
+            return "1";
         }
         return page;
     }