Hi,
When a column is indexed in the model, a symbol is placed next to it. However, when you have multiple indexes in a table, it is unclear which are single column-indexes or if it is a composite (multi-column) index. (In the latter case, it is also unclear what the order of the columns in the index is unless you actually look at the indexes on the table.)
If there was a way to indicate that in the diagram, that would be helpful for people making use of the model as a reference tool.