diff -r dee028db6e9b -r 73bdfa70b04e src/net/fortuna/ical4j/util/CompatibilityHints.java
--- a/src/net/fortuna/ical4j/util/CompatibilityHints.java	Tue Feb 10 19:25:00 2015 +0100
+++ b/src/net/fortuna/ical4j/util/CompatibilityHints.java	Tue Feb 10 19:38:00 2015 +0100
@@ -76,6 +76,11 @@
      * compatibility is enabled by setting this system property to "true".
      */
     public static final String KEY_NOTES_COMPATIBILITY = "ical4j.compatibility.notes";
+    
+    /**
+     * Support for vCard features that are not necessarily compatible with the iCalendar standard.
+     */
+    public static final String KEY_VCARD_COMPATIBILITY = "ical4j.compatibility.vcard";
 
     private static final Map HINTS = new ConcurrentHashMap();
     // preload known hints from the configurator