diff --git a/README.md b/README.md
index 417187b7c..b21bd1c9e 100644
--- a/README.md
+++ b/README.md
@@ -48,5 +48,6 @@ Contributing
 * Feel free to open an [Issue](https://github.com/Akarin-project/akarin/issues) if you have any problem with Akarin.
 * [Pull Request](https://github.com/Akarin-project/akarin/pulls) is welcomed, Akarin use [Mixin](https://github.com/SpongePowered/Mixin) to modify the code, you can checkout `sources` folder to see them. Moreover, add your name to the [LICENSE](https://github.com/Akarin-project/Akarin/blob/master/LICENSE.md) if you want to publish your code under the [MIT License](https://github.com/Akarin-project/Akarin/blob/master/licenses/MIT.md).
 * If you want to join the [Akarin-project](https://github.com/Akarin-project) team, you can send an email to `kira@kira.moe` with your experience and necessary information. Besides, welcome to join our [TIM Group](https://jq.qq.com/?_wv=1027&k=59q2kV4) to chat.
+* Note that you need add `work/Paper/Paper-Server` to the `Build Path` of your IDE manually to organize the *NMS* import, the raw *NMS* dependency was dragged to the `Paper-Parent` project.
 
 ![Akarin project](https://i.loli.net/2018/05/13/5af7fbbfbcddf.png)
\ No newline at end of file
diff --git a/sources/src/main/java/io/akarin/server/mixin/core/MixinMetrics.java b/sources/src/main/java/io/akarin/server/mixin/core/MixinMetrics.java
index a50d29068..e166aa2fe 100644
--- a/sources/src/main/java/io/akarin/server/mixin/core/MixinMetrics.java
+++ b/sources/src/main/java/io/akarin/server/mixin/core/MixinMetrics.java
@@ -3,7 +3,6 @@ package io.akarin.server.mixin.core;
 import java.util.List;
 
 import org.bukkit.Bukkit;
-import io.akarin.api.LogWrapper;
 import org.json.simple.JSONArray;
 import org.json.simple.JSONObject;
 import org.spongepowered.asm.mixin.Final;
diff --git a/sources/src/main/java/io/akarin/server/mixin/core/MixinVersionCommand.java b/sources/src/main/java/io/akarin/server/mixin/core/MixinVersionCommand.java
index d32fbef7d..cb2237011 100644
--- a/sources/src/main/java/io/akarin/server/mixin/core/MixinVersionCommand.java
+++ b/sources/src/main/java/io/akarin/server/mixin/core/MixinVersionCommand.java
@@ -64,16 +64,16 @@ public class MixinVersionCommand {
         // (this is really a special case that we cancel new tasks instead let them wait).
         versionObtaining = true;
         
-		if (hasVersion) {
-			long current = System.currentTimeMillis();
+        if (hasVersion) {
+            long current = System.currentTimeMillis();
             if (current - lastCheckMillis > 7200000 /* 2 hours */) {
                 lastCheckMillis = current;
-				hasVersion = false;
-			} else {
-				sender.sendMessage(versionMessage);
+                hasVersion = false;
+            } else {
+                sender.sendMessage(versionMessage);
                 return;
-			}
-		}
+            }
+        }
         if (!hasVersion) {
             obtainVersion(sender);
             /* TODO Option: legacy-versioning-compat */ currentSender = sender;
@@ -101,7 +101,7 @@ public class MixinVersionCommand {
         MCUtil.scheduleAsyncTask(() -> {
             // This should be lying in 'sendVersion' method, but comes here for relax main thread
             versionWaiters.add(sender);
-			sender.sendMessage("Checking version, please wait...");
+            sender.sendMessage("Checking version, please wait...");
             
             String version = Bukkit.getVersion();
             if (version == null) {