Update readme with @tag and @filter on same vertex

README.md

@@ -342,6 +342,9 @@ we may enable the addition of custom filtering operations via compiler plugins.
 Multiple `@filter` directives may be applied to the same field at once. Conceptually,
 it is as if the different `@filter` directives were joined by SQL `AND` keywords.
 
+Using a `@tag` and a `@filter` that references the tag within the same vertex is allowed,
+so long as the two not appear on the exact same property field.
+
 #### Passing Parameters
 
 The `@filter` directive accepts two types of parameters: runtime parameters and tagged parameters.