diff --git a/gradle.properties b/gradle.properties
index e855ebd..1eefcb8 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,4 +1,4 @@
 org.gradle.jvmargs=-Xmx3G
 org.gradle.daemon=false
 
-apiVersion=1.3.0
+apiVersion=1.3.1
diff --git a/src/main/java/de/bluecolored/bluemap/api/BlueMapAPI.java b/src/main/java/de/bluecolored/bluemap/api/BlueMapAPI.java
index 148d941..9399da9 100644
--- a/src/main/java/de/bluecolored/bluemap/api/BlueMapAPI.java
+++ b/src/main/java/de/bluecolored/bluemap/api/BlueMapAPI.java
@@ -46,10 +46,10 @@ public abstract class BlueMapAPI {
 	private static BlueMapAPI instance;
 
 	@Deprecated
-	private static Collection<BlueMapAPIListener> listener = new ArrayList<>(2);
+	private static final Collection<BlueMapAPIListener> listener = new ArrayList<>(2);
 	
-	private static Collection<Consumer<BlueMapAPI>> onEnableConsumers = new ArrayList<>(2);
-	private static Collection<Consumer<BlueMapAPI>> onDisableConsumers = new ArrayList<>(2);
+	private static final Collection<Consumer<BlueMapAPI>> onEnableConsumers = new ArrayList<>(2);
+	private static final Collection<Consumer<BlueMapAPI>> onDisableConsumers = new ArrayList<>(2);
 
 	/**
 	 * Getter for the {@link RenderAPI}.
diff --git a/src/main/java/de/bluecolored/bluemap/api/BlueMapAPIListener.java b/src/main/java/de/bluecolored/bluemap/api/BlueMapAPIListener.java
index 3be4c88..3a85102 100644
--- a/src/main/java/de/bluecolored/bluemap/api/BlueMapAPIListener.java
+++ b/src/main/java/de/bluecolored/bluemap/api/BlueMapAPIListener.java
@@ -24,6 +24,8 @@
  */
 package de.bluecolored.bluemap.api;
 
+import java.util.function.Consumer;
+
 /**
  * @deprecated Implementing {@link BlueMapAPIListener} can cause a ClassNotFoundException when you soft-depend on BlueMap and your plugin/mod gets used without BlueMap.
  * Use {@link BlueMapAPI#onEnable(Consumer)} and {@link BlueMapAPI#onDisable(Consumer)} instead.
diff --git a/src/main/java/de/bluecolored/bluemap/api/marker/Marker.java b/src/main/java/de/bluecolored/bluemap/api/marker/Marker.java
index a3238b0..52160bc 100644
--- a/src/main/java/de/bluecolored/bluemap/api/marker/Marker.java
+++ b/src/main/java/de/bluecolored/bluemap/api/marker/Marker.java
@@ -118,7 +118,7 @@ public interface Marker {
 	void setLabel(String label);
 	
 	/**
-	 * Gets the link-adress of this {@link Marker}.<br>
+	 * Gets the link-address of this {@link Marker}.<br>
 	 * If a link is present, this link will be followed when the user clicks on the marker in the web-app.
 	 * 
 	 * @return the {@link Optional} link
@@ -133,7 +133,7 @@ public interface Marker {
 	boolean isNewTab();
 	
 	/**
-	 * Sets the link-adress of this {@link Marker}.<br>
+	 * Sets the link-address of this {@link Marker}.<br>
 	 * If a link is present, this link will be followed when the user clicks on the marker in the web-app.
 	 * 
 	 * @param link the link, or <code>null</code> to disable the link
diff --git a/src/main/java/de/bluecolored/bluemap/api/marker/MarkerSet.java b/src/main/java/de/bluecolored/bluemap/api/marker/MarkerSet.java
index 148e776..fa3a20f 100644
--- a/src/main/java/de/bluecolored/bluemap/api/marker/MarkerSet.java
+++ b/src/main/java/de/bluecolored/bluemap/api/marker/MarkerSet.java
@@ -72,7 +72,14 @@ public interface MarkerSet {
 	 * @param toggleable whether this {@link MarkerSet} should be toggleable
 	 */
 	void setToggleable(boolean toggleable);
-	
+
+	/**
+	 * @deprecated method name has a typo, use {@link #isDefaultHidden()} instead.
+	 */
+	default boolean isDefautHidden() {
+		return isDefaultHidden();
+	}
+
 	/**
 	 * Checks if this {@link MarkerSet} is hidden by default.
 	 * <p>This is basically the default-state of the toggle-button from {@link #isToggleable()}. If this is <code>true</code> the markers of this marker set will initially be hidden and can be displayed using the toggle-button.</p> 
@@ -80,7 +87,7 @@ public interface MarkerSet {
 	 * @return whether this {@link MarkerSet} is hidden by default
 	 * @see #isToggleable()
 	 */
-	boolean isDefautHidden();
+	boolean isDefaultHidden();
 	
 	/**
 	 * Sets if this {@link MarkerSet} is hidden by default.