Update README.md

Author: Logende

documentation_user/examples/external_references/README.md

@@ -16,4 +16,9 @@ In the menu bar of the schema tab, there is a set of `utility` options for resol
 
 Furthermore, the schema diagram visualizes external references as nodes with a blue color frame and provides a button to resolve the reference directly in the diagram.
 
-![Reference in Diagram](./ref_diagram.png)
+![Reference in Diagram](./ref_diagram.png)
+
+Dealing with Cyclic References
+------------------------------
+
+If (external) references can not be resolved due to cyclic dependencies, instead use the utility to bundle the references. This way all external content is moved into the same file, but the schema still uses internal references, which can model cyclic dependencies.