diff --git a/src/main/java/world/bentobox/caveblock/CaveBlock.java b/src/main/java/world/bentobox/caveblock/CaveBlock.java
index 70dc5e9..452510b 100644
--- a/src/main/java/world/bentobox/caveblock/CaveBlock.java
+++ b/src/main/java/world/bentobox/caveblock/CaveBlock.java
@@ -24,7 +24,7 @@ public class CaveBlock extends GameModeAddon
 
     /**
      * Executes code when loading the addon. This is called before {@link #onEnable()}. This should preferably
-     * be used to setup configuration and worlds.
+     * be used to set up configuration and worlds.
      */
     @Override
     public void onLoad()
@@ -121,8 +121,8 @@ public class CaveBlock extends GameModeAddon
 
     /**
      * Make the worlds for this GameMode in this method. BentoBox will call it after onLoad() and before
-     * onEnable(). {@link #islandWorld} must be created and assigned, {@link #netherWorld} and {@link
-     * #endWorld} are optional and may be null.
+     * onEnable(). {@code islandWorld} must be created and assigned, {@code netherWorld} and {@code
+     * endWorld} are optional and may be null.
      */
     @Override
     public void createWorlds()
diff --git a/src/main/java/world/bentobox/caveblock/generators/Ore.java b/src/main/java/world/bentobox/caveblock/generators/Ore.java
index 7f2b6c0..901bdc7 100644
--- a/src/main/java/world/bentobox/caveblock/generators/Ore.java
+++ b/src/main/java/world/bentobox/caveblock/generators/Ore.java
@@ -5,7 +5,6 @@ import org.bukkit.Material;
 /**
  * @author tastybento
  * @param minY minimum Y level this ore should appear
- * @param minY maximum Y level this ore should appear
  * @param material Material
  * @param chance chance
  * @param blob maximum size of blob to generate
diff --git a/src/main/java/world/bentobox/caveblock/listeners/CustomHeightLimitations.java b/src/main/java/world/bentobox/caveblock/listeners/CustomHeightLimitations.java
index 7d4ecb9..b26e14b 100644
--- a/src/main/java/world/bentobox/caveblock/listeners/CustomHeightLimitations.java
+++ b/src/main/java/world/bentobox/caveblock/listeners/CustomHeightLimitations.java
@@ -16,14 +16,14 @@ import world.bentobox.caveblock.CaveBlock;
 
 
 /**
- * This listener checks player movement. If enabled, players will be deny to get over world depth limit and
+ * This listener checks player movement. If enabled, players will be denied to get over world depth limit and
  * if alternative teleports is enabled, then falling in void also will be processed.
  */
 public class CustomHeightLimitations implements Listener
 {
 	/**
 	 * Simple constructor
-	 * @param addon
+	 * @param addon Addon
 	 */
 	public CustomHeightLimitations(CaveBlock addon)
 	{
@@ -86,7 +86,7 @@ public class CustomHeightLimitations implements Listener
 
 
 	/**
-	 * This method checks and returns if current player movement from location to to location should be
+	 * This method checks and returns if current player movement from location to location should be
 	 * managed by current addon.
 	 * @param nextY NextY location for player.
  	 * @param player Player who makes movement
@@ -120,10 +120,10 @@ public class CustomHeightLimitations implements Listener
 	/**
 	 * CaveBlock addon
 	 */
-	private CaveBlock addon;
+	private final CaveBlock addon;
 
 	/**
 	 * This variable store world height.
 	 */
-	private int worldHeight;
+	private final int worldHeight;
 }