uml/associations.md

@@ -3,11 +3,11 @@
 # Associations
 An Association classifies a set of tuples representing links between typed instances, e.g., two instances of classes at runtime.
 
-## Example
+### Example
 ![Association Class Diagram](https://git.informatik.uni-kiel.de/ag-se/teaching-public/wikis/uml-sources/img/association.png)
 
 # Aggregation and Composition
-Aggregation and Composition are subsets of associations meaning they are specific cases of association.
+Aggregation and Composition are subsets of associations, i.e., they are specific cases of association.
 In both aggregation and composition object of one class "owns" object of another class. But there is a small difference.
 
 ## Aggregation