diff --git a/cura/Settings/GlobalStack.py b/cura/Settings/GlobalStack.py
index a8e6f2f2c0..15c95c9394 100755
--- a/cura/Settings/GlobalStack.py
+++ b/cura/Settings/GlobalStack.py
@@ -35,6 +35,11 @@ class GlobalStack(CuraContainerStack):
         super().__init__(container_id)
 
         self.setMetaDataEntry("type", "machine")  # For backward compatibility
+
+        # TL;DR: If Cura is looking for printers that belong to the same group, it should use "group_id".
+        # Each GlobalStack by default belongs to a group which is identified via "group_id". This group_id is used to
+        # figure out which GlobalStacks are in the printer cluster for example without knowing the implementation
+        # details such as the um_network_key or some other identifier that's used by the underlying device plugin.
         self.setMetaDataEntry("group_id", str(uuid.uuid4()))  # Assign a new GlobalStack to a unique group by default
 
         self._extruders = {}  # type: Dict[str, "ExtruderStack"]