diff --git a/pom.xml b/pom.xml
index 4d574e84d..d3ce81815 100644
--- a/pom.xml
+++ b/pom.xml
@@ -93,6 +93,7 @@
   	<groupId>io.netty</groupId>
   	<artifactId>netty-transport-native-epoll</artifactId>
   	<version>4.0.28.Final</version>
+        <scope>provided</scope>
   </dependency>
   <dependency>
   	<groupId>io.netty</groupId>
@@ -196,7 +197,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-pmd-plugin</artifactId>
-          <version>3.0.1</version>
+          <version>3.5</version>
           <executions>
             <execution>
               <phase>verify</phase>
@@ -217,7 +218,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-checkstyle-plugin</artifactId>
-          <version>2.10</version>
+          <version>2.15</version>
           <executions>
             <execution>
               <phase>verify</phase>
@@ -227,7 +228,6 @@
             </execution>
           </executions>
           <configuration>
-            <includes>src/main/java/org/redisson/</includes>
             <consoleOutput>true</consoleOutput>
             <enableRSS>false</enableRSS>
             <configLocation>/checkstyle.xml</configLocation>
diff --git a/src/main/java/org/redisson/Config.java b/src/main/java/org/redisson/Config.java
index 39089d35d..466a620f3 100644
--- a/src/main/java/org/redisson/Config.java
+++ b/src/main/java/org/redisson/Config.java
@@ -194,6 +194,7 @@ public class Config {
     /**
      * Activates an unix socket if servers binded to loopback interface.
      * Also used for epoll transport activation.
+     * <b>netty-transport-native-epoll</b> library should be in classpath
      *
      * @param useLinuxNativeEpoll
      * @return