diff --git a/docs/Documentation-CHN/UserGuide/7-Session API/1-Session API.md b/docs/Documentation-CHN/UserGuide/7-Session API/1-Session API.md
index 9b21474072f7ca30c7a77511a8de3b52ad44a305..6e733351b21c63b4bfe66214f11978c2408603b0 100644
--- a/docs/Documentation-CHN/UserGuide/7-Session API/1-Session API.md	
+++ b/docs/Documentation-CHN/UserGuide/7-Session API/1-Session API.md	
@@ -26,7 +26,7 @@
 ## 依赖
 
 * JDK >= 1.8
-* Maven >= 3.0
+* Maven >= 3.1
 
 ## 安装到本地 maven 库
 
diff --git a/docs/Documentation/UserGuide/4-Deployment and Management/1-Deployment.md b/docs/Documentation/UserGuide/4-Deployment and Management/1-Deployment.md
index 5d6ebf7f8e64d290f1e6b2e9f801ccaa45cb9a09..a9c3b8e8c16a7b17649ac85a0e4ce5a73999d119 100644
--- a/docs/Documentation/UserGuide/4-Deployment and Management/1-Deployment.md	
+++ b/docs/Documentation/UserGuide/4-Deployment and Management/1-Deployment.md	
@@ -33,7 +33,7 @@ IoTDB provides you two installation methods, you can refer to the following sugg
 To install and use IoTDB, you need to have:
 
 1. Java >= 1.8 (Please make sure the environment path has been set)
-2. Maven >= 3.0 (If you want to compile and install IoTDB from source code)
+2. Maven >= 3.1 (If you want to compile and install IoTDB from source code)
 3. TsFile >= 0.7.0 (TsFile Github page: [https://github.com/thulab/tsfile](https://github.com/thulab/tsfile))
 4. IoTDB-JDBC >= 0.7.0 (IoTDB-JDBC Github page: [https://github.com/thulab/iotdb-jdbc](https://github.com/thulab/iotdb-jdbc))
 
diff --git a/docs/Documentation/UserGuide/6-JDBC API/1-JDBC API.md b/docs/Documentation/UserGuide/6-JDBC API/1-JDBC API.md
index d1c865f7f7e107f492db147bc4d4ee0bca3192f6..193c55cd83337f7faa090f5ff039b7b0839426fe 100644
--- a/docs/Documentation/UserGuide/6-JDBC API/1-JDBC API.md	
+++ b/docs/Documentation/UserGuide/6-JDBC API/1-JDBC API.md	
@@ -26,7 +26,7 @@
 ## Dependencies
 
 * JDK >= 1.8
-* Maven >= 3.0
+* Maven >= 3.1
 
 ## How to package only jdbc project
 
diff --git a/docs/Documentation/UserGuide/7-Session API/1-Session API.md b/docs/Documentation/UserGuide/7-Session API/1-Session API.md
index b2cd10cf21b05ed1cc36a4809f86490f6377e1e5..04e35d040a8218179c00af4fe7109a3dbb50679d 100644
--- a/docs/Documentation/UserGuide/7-Session API/1-Session API.md	
+++ b/docs/Documentation/UserGuide/7-Session API/1-Session API.md	
@@ -26,7 +26,7 @@
 ## Dependencies
 
 * JDK >= 1.8
-* Maven >= 3.0
+* Maven >= 3.1
 
 ## How to package only client module
 
diff --git a/jdbc/README.md b/jdbc/README.md
index 3e77c38e754ab074df20f06deae9070b7b8cb53b..73ddc58b3e41a24ce64eeb144191750e58f15a48 100644
--- a/jdbc/README.md
+++ b/jdbc/README.md
@@ -24,7 +24,7 @@
 ## Dependencies
 
 * JDK >= 1.8
-* Maven >= 3.0
+* Maven >= 3.1
 
 ## How to package only jdbc project
 
diff --git a/tsfile/src/main/java/org/apache/iotdb/tsfile/encoding/encoder/RegularDataEncoder.java b/tsfile/src/main/java/org/apache/iotdb/tsfile/encoding/encoder/RegularDataEncoder.java
index 8fa49aaa7cdf41ab9e053713adf0b1e3d4b90160..ce4d49880e333dc9142f343ff53e4d9105c92b4d 100644
--- a/tsfile/src/main/java/org/apache/iotdb/tsfile/encoding/encoder/RegularDataEncoder.java
+++ b/tsfile/src/main/java/org/apache/iotdb/tsfile/encoding/encoder/RegularDataEncoder.java
@@ -118,7 +118,6 @@ public abstract class RegularDataEncoder extends Encoder {
     /**
      * constructor of IntRegularEncoder which is a sub-class of RegularDataEncoder.
      *
-     * @param size - the number how many numbers to be packed into a block.
      */
     public IntRegularEncoder() {
       this(BLOCK_DEFAULT_SIZE);