message: fixup artifacts commit
diff: # Hierarchies
  +
  There are 2 primary concepts for creating hierarchies: rules and specifications.
  ## Rules
  @@ -24,10 +25,12 @@ parent node.
  **Note:** grouping and sorting is done at specification level which
  means nodes generated from different specifications do not get grouped and sorted together.
  -## Grouping
  +## Hierarchy Customization
  -There's an additional hierarchy-related rule used for advanced grouping:
  -- [GroupingRule](./GroupingRule.md)
  +All [general use customization rules](../Customization/index.md#rules) can be applied to hierarchies. In addition, there
  +are some hierarchy-specific customization rules:
  +- [GroupingRule](./GroupingRule.md) for advanced grouping
  +- [NodeArtifactsRule](./NodeArtifactsRule.md) to help create hierarchies for specific cases
  ## Expressions
  - [ECExpressions](./ECExpressions.md)
  