diff --git a/src/main/java/net/minestom/server/registry/ProtocolObject.java b/src/main/java/net/minestom/server/registry/ProtocolObject.java
index a2d695ac8..ab201b9b9 100644
--- a/src/main/java/net/minestom/server/registry/ProtocolObject.java
+++ b/src/main/java/net/minestom/server/registry/ProtocolObject.java
@@ -3,20 +3,25 @@ package net.minestom.server.registry;
 import net.kyori.adventure.key.Key;
 import net.kyori.adventure.key.Keyed;
 import net.minestom.server.utils.NamespaceID;
+import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.NotNull;
 
 public interface ProtocolObject extends Keyed {
 
+    @Contract(pure = true)
     @NotNull NamespaceID namespace();
 
     @Override
+    @Contract(pure = true)
     default @NotNull Key key() {
         return namespace();
     }
 
+    @Contract(pure = true)
     default @NotNull String name() {
         return namespace().asString();
     }
 
+    @Contract(pure = true)
     int id();
 }