diff --git a/cura/Settings/CuraContainerRegistry.py b/cura/Settings/CuraContainerRegistry.py
index ae4fd2e5c7..bf8e475c38 100644
--- a/cura/Settings/CuraContainerRegistry.py
+++ b/cura/Settings/CuraContainerRegistry.py
@@ -28,6 +28,11 @@ class CuraContainerRegistry(ContainerRegistry):
         super().__init__(*args, **kwargs)
 
     ##  Overridden from ContainerRegistry
+    #
+    #   Adds a container to the registry.
+    #
+    #   This will also try to convert a ContainerStack to either Extruder or
+    #   Global stack based on metadata information.
     @override(ContainerRegistry)
     def addContainer(self, container):
         # Note: Intentional check with type() because we want to ignore subclasses
@@ -295,6 +300,7 @@ class CuraContainerRegistry(ContainerRegistry):
             return parseBool(global_container_stack.getMetaDataEntry("has_machine_quality", False))
         return False
 
+    ##  Convert an "old-style" pure ContainerStack to either an Extruder or Global stack.
     def _convertContainerStack(self, container):
         assert type(container) == ContainerStack
 
diff --git a/cura/Settings/CuraContainerStack.py b/cura/Settings/CuraContainerStack.py
index df8cc6078d..2b8a1ebf6d 100644
--- a/cura/Settings/CuraContainerStack.py
+++ b/cura/Settings/CuraContainerStack.py
@@ -426,8 +426,6 @@ class CuraContainerStack(ContainerStack):
     #   - Otherwise, if the machine definition has a metadata entry "preferred_material", try to find a material that matches the specified ID.
     #
     #   \return The container that should be used as default, or None if nothing was found or the machine does not use materials.
-    #
-    #
     def findDefaultMaterial(self) -> Optional[ContainerInterface]:
         definition = self._getMachineDefinition()
         if not definition.getMetaDataEntry("has_materials"):
@@ -467,6 +465,12 @@ class CuraContainerStack(ContainerStack):
         Logger.log("w", "Could not find a valid material for stack {stack}", stack = self.id)
         return None
 
+    ##  Find the quality that should be used as "default" quality.
+    #
+    #   This will search for qualities that match the current definition and pick the preferred one,
+    #   if specified by the machine definition.
+    #
+    #   \return The container that should be used as default, or None if nothing was found.
     def findDefaultQuality(self) -> Optional[ContainerInterface]:
         definition = self._getMachineDefinition()
         registry = ContainerRegistry.getInstance()