Document current limitation about references in EXEC/END-EXEC blocks

README.md

@@ -174,10 +174,17 @@ every reference to this item.
 
 ![Go to References](./assets/superbol-goto-references.gif)
 
+> [!NOTE]
+> (Temporary limitation)
+>
+> In addition to limitations mentioned in [Go to
+> Definition](#go-to-definition), references that occur in
+> `EXEC`/`END-EXEC` blocks are also not taken into account yet.
+
 ### Reference Information
 
 The extension shows inline reference information above definitons of
-data item and elements of the procedure division.  
+data items and elements of the procedure division.  
 The same limitations as for [Go to Definition](#go-to-definition)
 apply.