add that keywords can be depenedent upon other keywords' values

Author: gregsdennis

jsonschema-core.md

@@ -524,8 +524,8 @@ to inform the user of the evaluation path that produced the error or annotation.
 ### Keyword Interactions
 
 Keywords MAY modify their behavior based on the presence or absence of another
-keyword in the same [schema object](#schema-document). Such keywords MUST NOT
-result in a circular dependency.
+keyword or its value in the same [schema object](#schema-document). Such
+keywords MUST NOT result in a circular dependency.
 
 Unless otherwise specified, keywords act independently.