diff --git a/gradle.properties b/gradle.properties
index 1b0292d..4dc4de0 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,6 +1,6 @@
 ## Messiva
 
-PROJECT_VERSION = 0.1.0.0
+PROJECT_VERSION = 0.1.0.1
 
 ## dependencies
 
diff --git a/src/main/java/cc/sukazyo/messiva/Logger.java b/src/main/java/cc/sukazyo/messiva/Logger.java
index 9230cd9..ab406b5 100644
--- a/src/main/java/cc/sukazyo/messiva/Logger.java
+++ b/src/main/java/cc/sukazyo/messiva/Logger.java
@@ -1,6 +1,7 @@
 package cc.sukazyo.messiva;
 
 import cc.sukazyo.messiva.appender.IAppender;
+import cc.sukazyo.messiva.log.ILogLevelImpl;
 import cc.sukazyo.messiva.log.Log;
 import cc.sukazyo.messiva.log.LogLevel;
 import cc.sukazyo.messiva.log.Message;
@@ -9,7 +10,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
-public class Logger {
+public class Logger implements ILogLevelImpl {
 	
 	public final List<IAppender> appends = new ArrayList<>();
 	
@@ -23,6 +24,10 @@ public class Logger {
 		pushToAllAppender(new Log(1, new Message(message), LogLevel.TRACE));
 	}
 	
+	public void debug (String message) {
+		pushToAllAppender(new Log(1, new Message(message), LogLevel.DEBUG));
+	}
+	
 	public void info (String message) {
 		pushToAllAppender(new Log(1, new Message(message), LogLevel.INFO));
 	}
diff --git a/src/main/java/cc/sukazyo/messiva/log/ILogLevelImpl.java b/src/main/java/cc/sukazyo/messiva/log/ILogLevelImpl.java
new file mode 100644
index 0000000..7921b26
--- /dev/null
+++ b/src/main/java/cc/sukazyo/messiva/log/ILogLevelImpl.java
@@ -0,0 +1,17 @@
+package cc.sukazyo.messiva.log;
+
+public interface ILogLevelImpl {
+	
+	void trace (String message);
+	
+	void debug (String message);
+	
+	void info (String message);
+	
+	void warn (String message);
+	
+	void error (String message);
+	
+	void fatal (String message);
+	
+}
diff --git a/src/main/java/cc/sukazyo/messiva/log/LogLevel.java b/src/main/java/cc/sukazyo/messiva/log/LogLevel.java
index 0fe063c..bbdf42a 100644
--- a/src/main/java/cc/sukazyo/messiva/log/LogLevel.java
+++ b/src/main/java/cc/sukazyo/messiva/log/LogLevel.java
@@ -3,6 +3,7 @@ package cc.sukazyo.messiva.log;
 public enum LogLevel {
 	
 	TRACE(-1f, "TRAC"),
+	DEBUG(-0.1f, "DBUG"),
 	INFO(0f, "INFO"),
 	WARN(0.5f, "WARN"),
 	ERROR(1f, "ERRO"),