clarification wrt. subqueries

Author: hvub

modules/ROOT/pages/syntax/variables.adoc

@@ -24,7 +24,13 @@ Information regarding the naming of variables may be found xref::syntax/naming.a
 .Variables are only visible in the same query part
 ====
 Variables are not carried over to subsequent queries.
-If multiple query parts are chained together using `WITH`, variables have to be listed in the `WITH` clause to be carried over to the next part.
+If multiple query parts are chained together using `WITH`, variables defined in one part have to be listed in the `WITH` clause to be carried over to the next part.
 For more information see xref::clauses/with.adoc[WITH].
 ====
 
+[IMPORTANT]
+.Variables imported into a `CALL` subquery are visible in the whole subquery
+====
+Even if the subquery is a multiple query parts are chained together using `WITH`, variables imported from the outer query do not have to be listed in the `WITH` clause to be visible in the next part.
+For more information see xref::subqueries/call-subquery.adoc#variable-scope-clause[The variable scope clause].
+====