diff --git a/SpigotCore_Main/src/de/steamwar/acommand/TestCommand.java b/SpigotCore_Main/src/de/steamwar/acommand/TestCommand.java
index a09a896..aa8ca89 100644
--- a/SpigotCore_Main/src/de/steamwar/acommand/TestCommand.java
+++ b/SpigotCore_Main/src/de/steamwar/acommand/TestCommand.java
@@ -1,9 +1,33 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package de.steamwar.acommand;
 
 import de.steamwar.command.SWCommand;
+import de.steamwar.command.TypeMapper;
 import org.bukkit.Material;
 import org.bukkit.entity.Player;
 
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
 public class TestCommand extends SWCommand {
 
     public TestCommand() {
@@ -18,10 +42,33 @@ public class TestCommand extends SWCommand {
     }
 
     // Another Command, subCommands can be implemented with the Register Annotation,
-    // you can Implement custom Mappers Annotation by @Mapper on a Parameter
+    // you can use custom Mappers by putting a Mapper Annotation on a Parameter
     @Register({"two"})
     public void testTwo(Player player, int i, @Mapper("Hello World") Material material) {
 
     }
 
+    // Add Custom Mapper when this command is registered, all Mapper of you class will be
+    // created first and than the Commands. Do not use this mapper outside your class, as
+    // it can only create failures. Use on your own risk. Definition order should be considered.
+    @Mapper("Hello World")
+    public TypeMapper<Material> materialTypeMapper() {
+        List<String> tabCompletes = Arrays.stream(Material.values())
+                .filter(Material::isSolid)
+                .map(Material::name)
+                .map(String::toLowerCase)
+                .collect(Collectors.toList());
+        return new TypeMapper<>() {
+            @Override
+            public Material map(String s) {
+                return Material.valueOf(s.toUpperCase());
+            }
+
+            @Override
+            public List<String> tabCompletes(String s) {
+                return tabCompletes;
+            }
+        };
+    }
+
 }
diff --git a/SpigotCore_Main/src/de/steamwar/command/SWCommand.java b/SpigotCore_Main/src/de/steamwar/command/SWCommand.java
index 4919a41..de49a86 100644
--- a/SpigotCore_Main/src/de/steamwar/command/SWCommand.java
+++ b/SpigotCore_Main/src/de/steamwar/command/SWCommand.java
@@ -74,24 +74,26 @@ public abstract class SWCommand {
         });
 
         for (Method method : getClass().getDeclaredMethods()) {
-            Register register = method.getDeclaredAnnotation(Register.class);
-            if (register == null) {
-                continue;
-            }
-            if (!validMethod(method)) {
-                continue;
-            }
-            commandSet.add(new SubCommand(this, method));
+            addMapper(method);
+        }
+        for (Method method : getClass().getDeclaredMethods()) {
+            addCommand(method);
         }
     }
 
-    private boolean validMethod(Method method) {
+    private void addCommand(Method method) {
+        Register register = method.getDeclaredAnnotation(Register.class);
+        Mapper methodMapper = method.getDeclaredAnnotation(Mapper.class);
+        if (register == null || methodMapper != null) {
+            return;
+        }
+
         Parameter[] parameters = method.getParameters();
         if (parameters.length == 0) {
-            return false;
+            return;
         }
         if (!CommandSender.class.isAssignableFrom(parameters[0].getType())) {
-            return false;
+            return;
         }
         for (int i = 1; i < parameters.length; i++) {
             Parameter parameter = parameters[i];
@@ -107,9 +109,32 @@ public abstract class SWCommand {
             if (mapper != null) {
                 name = mapper.value();
             }
-            if (!SWCommandUtils.MAPPER_FUNCTIONS.containsKey(name)) return false;
+            if (!SWCommandUtils.MAPPER_FUNCTIONS.containsKey(name)) return;
+        }
+        commandSet.add(new SubCommand(this, method));
+    }
+
+    private void addMapper(Method method) {
+        Register register = method.getDeclaredAnnotation(Register.class);
+        Mapper methodMapper = method.getDeclaredAnnotation(Mapper.class);
+        if (register != null || methodMapper == null) {
+            return;
+        }
+
+        Parameter[] parameters = method.getParameters();
+        if (parameters.length != 0) {
+            return;
+        }
+        if (method.getReturnType() != TypeMapper.class) {
+            return;
+        }
+        try {
+            method.setAccessible(true);
+            Object object = method.invoke(this);
+            SWCommandUtils.addMapper(methodMapper.value(), (TypeMapper<?>) object);
+        } catch (Exception e) {
+            throw new SecurityException(e.getMessage(), e);
         }
-        return true;
     }
 
     protected final void setHelpMessage(Consumer<CommandSender> helpMessage) {
@@ -128,7 +153,7 @@ public abstract class SWCommand {
     }
 
     @Retention(RetentionPolicy.RUNTIME)
-    @Target({ElementType.PARAMETER})
+    @Target({ElementType.PARAMETER, ElementType.METHOD})
     protected @interface Mapper {
         String value();
     }
diff --git a/SpigotCore_Main/src/de/steamwar/command/SubCommand.java b/SpigotCore_Main/src/de/steamwar/command/SubCommand.java
index ab0c8ca..b04abf5 100644
--- a/SpigotCore_Main/src/de/steamwar/command/SubCommand.java
+++ b/SpigotCore_Main/src/de/steamwar/command/SubCommand.java
@@ -1,3 +1,22 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package de.steamwar.command;
 
 import org.bukkit.command.CommandSender;