diff --git a/pom.xml b/pom.xml
index bded03c..f7bfe23 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,14 +5,14 @@
     <modelVersion>4.0.0</modelVersion>
 
     <groupId>xyz.mineconomia</groupId>
-    <artifactId>MineconomiaCOre</artifactId>
+    <artifactId>MineconomiaCore</artifactId>
     <version>1.0-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>MineconomiaCore</name>
 
     <properties>
-        <java.version>1.8</java.version>
+        <java.version>1.17</java.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 
@@ -70,6 +70,12 @@
     </repositories>
 
     <dependencies>
+        <dependency>
+            <groupId>org.spigotmc</groupId>
+            <artifactId>spigot-api</artifactId>
+            <version>1.18.2-R0.1-SNAPSHOT</version>
+            <scope>provided</scope>
+        </dependency>
         <dependency> 
             <groupId>com.github.MilkBowl</groupId>
             <artifactId>VaultAPI</artifactId>
@@ -81,18 +87,9 @@
             <artifactId>arangodb-java-driver</artifactId>
             <version>6.13.0</version>
         </dependency>
-        <dependency>
-            <groupId>org.spigotmc</groupId>
-            <artifactId>spigot-api</artifactId>
-            <version>1.20-R0.1-SNAPSHOT</version>
-            <scope>provided</scope>
-        </dependency>
+
         <!-- https://mvnrepository.com/artifact/org.hibernate.orm/hibernate-core -->
-        <dependency>
-            <groupId>org.hibernate.orm</groupId>
-            <artifactId>hibernate-core</artifactId>
-            <version>6.3.0.Final</version>
-        </dependency>
+
 
         <dependency>
             <groupId>org.jetbrains</groupId>
diff --git a/src/main/java/xyz/mineconomia/mineconomiacore/MineconomiaCore.java b/src/main/java/xyz/mineconomia/mineconomiacore/MineconomiaCore.java
index 60d140e..03406c7 100644
--- a/src/main/java/xyz/mineconomia/mineconomiacore/MineconomiaCore.java
+++ b/src/main/java/xyz/mineconomia/mineconomiacore/MineconomiaCore.java
@@ -24,6 +24,8 @@ public final class MineconomiaCore extends JavaPlugin {
         // Plugin startup logic
         saveDefaultConfig();
         MineconomiaCore plugin= getPlugin(MineconomiaCore.class);
+
+        //Tohle třeba změnit později - jakub
         Logger logger= plugin.getLogger();
             logger.info(" ");
             logger.info("      ╔═══════════════════╗");
diff --git a/src/main/java/xyz/mineconomia/mineconomiacore/PDC.java b/src/main/java/xyz/mineconomia/mineconomiacore/PDC.java
index 4fe0af9..6475ae4 100644
--- a/src/main/java/xyz/mineconomia/mineconomiacore/PDC.java
+++ b/src/main/java/xyz/mineconomia/mineconomiacore/PDC.java
@@ -6,10 +6,13 @@ import org.bukkit.inventory.meta.ItemMeta;
 import org.bukkit.persistence.PersistentDataContainer;
 import org.bukkit.persistence.PersistentDataType;
 
+
+//Used by other classes for easy manipulation with persistentDataContainer
 public class PDC {
 
 
 
+
         public static void WritePlayerPDC(Player player, String key, PersistentDataType type, Object value){
             NamespacedKey nKey = new NamespacedKey(MineconomiaCore.getPlugin(MineconomiaCore.class), key);
             PersistentDataContainer pdc = player.getPersistentDataContainer();
diff --git a/src/main/java/xyz/mineconomia/mineconomiacore/commands/BookCommand.java b/src/main/java/xyz/mineconomia/mineconomiacore/commands/BookCommand.java
index f1ddce3..013a6c1 100644
--- a/src/main/java/xyz/mineconomia/mineconomiacore/commands/BookCommand.java
+++ b/src/main/java/xyz/mineconomia/mineconomiacore/commands/BookCommand.java
@@ -9,7 +9,11 @@ import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 import xyz.upperlevel.spigot.book.BookUtil;
 
+
+
 public class BookCommand implements CommandExecutor {
+
+    //Experimentální. Bude se měnit
     @Override
     public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
         if (sender instanceof Player) {
diff --git a/src/main/java/xyz/mineconomia/mineconomiacore/commands/mcore.java b/src/main/java/xyz/mineconomia/mineconomiacore/commands/mcore.java
index 0867911..32d3a02 100644
--- a/src/main/java/xyz/mineconomia/mineconomiacore/commands/mcore.java
+++ b/src/main/java/xyz/mineconomia/mineconomiacore/commands/mcore.java
@@ -25,7 +25,7 @@ public class mcore implements CommandExecutor {
             ItemStack item = inventory.getItemInMainHand();
             ItemMeta meta = item.getItemMeta();
             assert meta != null;
-            PDC.WriteItemMetaPDC(meta, "special", PersistentDataType.BOOLEAN,true);
+            PDC.WriteItemMetaPDC(meta, "special", PersistentDataType.INTEGER,1);
             item.setItemMeta(meta);
             config.set("special.item", item);
             try {
diff --git a/src/main/java/xyz/mineconomia/mineconomiacore/database.java b/src/main/java/xyz/mineconomia/mineconomiacore/database.java
index 71d4db5..c9b1bd9 100644
--- a/src/main/java/xyz/mineconomia/mineconomiacore/database.java
+++ b/src/main/java/xyz/mineconomia/mineconomiacore/database.java
@@ -7,6 +7,7 @@ import org.bukkit.configuration.file.FileConfiguration;
 
 public interface database {
     FileConfiguration config = MineconomiaCore.getPlugin(MineconomiaCore.class).getConfig();
+    //creates public db session that can be acessed by the rest of plugin
     ArangoDB arangodb = new ArangoDB.Builder()
             .host(config.getString("database.host"), config.getInt("database.port"))
             .user(config.getString("database.user"))
diff --git a/src/main/java/xyz/mineconomia/mineconomiacore/events/specialEvents.java b/src/main/java/xyz/mineconomia/mineconomiacore/events/specialEvents.java
index 9e542ec..8501314 100644
--- a/src/main/java/xyz/mineconomia/mineconomiacore/events/specialEvents.java
+++ b/src/main/java/xyz/mineconomia/mineconomiacore/events/specialEvents.java
@@ -114,7 +114,7 @@ public class specialEvents implements Listener {
          bossBar.removePlayer(player);
      }
      private static boolean isSpecial(ItemStack itemStack){
-        return PDC.GetItemMetaPDC(Objects.requireNonNull(itemStack.getItemMeta()), "special", PersistentDataType.BOOLEAN) != null;
+        return PDC.GetItemMetaPDC(Objects.requireNonNull(itemStack.getItemMeta()), "special", PersistentDataType.INTEGER) != null;
     }
 
 }
diff --git a/src/main/java/xyz/mineconomia/mineconomiacore/handlers/FHBHandler.java b/src/main/java/xyz/mineconomia/mineconomiacore/handlers/FHBHandler.java
index 1bf8487..d547c65 100644
--- a/src/main/java/xyz/mineconomia/mineconomiacore/handlers/FHBHandler.java
+++ b/src/main/java/xyz/mineconomia/mineconomiacore/handlers/FHBHandler.java
@@ -16,6 +16,8 @@ import java.util.Random;
 import java.util.concurrent.TimeUnit;
 
 public class FHBHandler implements Listener {
+
+    //experimentální... musí být později upraveno
     @EventHandler
     public void onFHBHit(ProjectileHitEvent event) throws InterruptedException {
         if (event.getEntity() instanceof Snowball){
diff --git a/src/main/java/xyz/mineconomia/mineconomiacore/handlers/SignHandler.java b/src/main/java/xyz/mineconomia/mineconomiacore/handlers/SignHandler.java
index 30ce621..a819a8d 100644
--- a/src/main/java/xyz/mineconomia/mineconomiacore/handlers/SignHandler.java
+++ b/src/main/java/xyz/mineconomia/mineconomiacore/handlers/SignHandler.java
@@ -5,7 +5,10 @@ import org.bukkit.block.Block;
 import org.bukkit.block.Sign;
 import org.bukkit.block.BlockState;
 
+
 public class SignHandler {
+
+    //Implement for
     public static void changeSignText(Location location, String line0, String line1, String line2, String line3) {
         Block block = location.getBlock();
         BlockState state = block.getState();