diff --git a/src/api/java/appeng/api/config/Upgrades.java b/src/api/java/appeng/api/config/Upgrades.java
index 8a24de168..5f1239a43 100644
--- a/src/api/java/appeng/api/config/Upgrades.java
+++ b/src/api/java/appeng/api/config/Upgrades.java
@@ -77,8 +77,8 @@ public enum Upgrades {
      * @param item         machine in which this upgrade can be installed
      * @param maxSupported amount how many upgrades can be installed
      * @param tooltipGroup If more than one item of the same group are supported,
-     *                     the tooltip will show this group name instead. If the
-     *                     items have different maxSupported values, the highest
+     *                     the tooltip will show this translation key instead. If
+     *                     the items have different maxSupported values, the highest
      *                     will be shown.
      */
     public void registerItem(final IItemProvider item, final int maxSupported, @Nullable String tooltipGroup) {
@@ -137,6 +137,7 @@ public enum Upgrades {
         private final Item item;
         private final Block block;
         private final int maxCount;
+        // Translation key of the tooltip group
         @Nullable
         private final String tooltipGroup;