diff --git a/eco-api/src/main/java/com/willfp/eco/core/gui/menu/Menu.java b/eco-api/src/main/java/com/willfp/eco/core/gui/menu/Menu.java
index 96487b59..68bdc1f8 100644
--- a/eco-api/src/main/java/com/willfp/eco/core/gui/menu/Menu.java
+++ b/eco-api/src/main/java/com/willfp/eco/core/gui/menu/Menu.java
@@ -82,6 +82,7 @@ public interface Menu {
      * @param type   The type.
      * @param <T>    The type.
      * @param <Z>    The type.
+     * @return The data.
      */
     @Nullable <T, Z> T readData(@NotNull Player player,
                                 @NotNull NamespacedKey key,
diff --git a/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/EcoMenu.kt b/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/EcoMenu.kt
index 6c8edbc0..4089b611 100644
--- a/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/EcoMenu.kt
+++ b/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/EcoMenu.kt
@@ -88,6 +88,7 @@ class EcoMenu(
         val inventory = MenuHandler.getExtendedInventory(player.openInventory.topInventory)
         inventory ?: return
         inventory.data[key] = value
+        inventory.refresh(player)
     }
 
     override fun <T : Any, Z : Any> readData(player: Player, key: NamespacedKey, type: PersistentDataType<T, Z>): T? {