diff --git a/eco-api/src/main/java/com/willfp/eco/core/Eco.java b/eco-api/src/main/java/com/willfp/eco/core/Eco.java
index 72996060..5f5d8162 100644
--- a/eco-api/src/main/java/com/willfp/eco/core/Eco.java
+++ b/eco-api/src/main/java/com/willfp/eco/core/Eco.java
@@ -18,7 +18,10 @@ public class Eco {
     @ApiStatus.Internal
     private Handler handler;
 
-
+    /**
+     * Set the handler.
+     * @param handler The handler.
+     */
     @ApiStatus.Internal
     public void setHandler(@NotNull final Handler handler) {
         Validate.isTrue(Eco.handler == null, "Already initialized!");
@@ -41,9 +44,6 @@ public class Eco {
      * that shouldn't be used in your plugins.
      *
      * @return The handler.
-     * @apiNote As of eco 6.12.0, the handler is no longer regarded as part
-     * of the eco API. It is scheduled to be made internal-only *somehow* at
-     * some point in the future.
      */
     @ApiStatus.Internal
     public Handler getHandler() {
diff --git a/eco-api/src/main/java/com/willfp/eco/core/data/PlayerProfile.java b/eco-api/src/main/java/com/willfp/eco/core/data/PlayerProfile.java
index 3801cbf5..1bf3ed6e 100644
--- a/eco-api/src/main/java/com/willfp/eco/core/data/PlayerProfile.java
+++ b/eco-api/src/main/java/com/willfp/eco/core/data/PlayerProfile.java
@@ -8,6 +8,9 @@ import org.jetbrains.annotations.Nullable;
 
 import java.util.UUID;
 
+/**
+ * Persistent data storage interface for players.
+ */
 public interface PlayerProfile {
     /**
      * Write a key to a player's persistent data.
diff --git a/eco-api/src/main/java/com/willfp/eco/core/data/keys/PersistentDataKey.java b/eco-api/src/main/java/com/willfp/eco/core/data/keys/PersistentDataKey.java
index 429f93ac..b538adbc 100644
--- a/eco-api/src/main/java/com/willfp/eco/core/data/keys/PersistentDataKey.java
+++ b/eco-api/src/main/java/com/willfp/eco/core/data/keys/PersistentDataKey.java
@@ -33,6 +33,7 @@ public class PersistentDataKey<T> {
      * Create a new Persistent Data Key.
      *
      * @param key          The key.
+     * @param type         The data type.
      * @param defaultValue The default value.
      */
     public PersistentDataKey(@NotNull final NamespacedKey key,