diff --git a/core/model/fieldtypes/CompositeDBField.php b/core/model/fieldtypes/CompositeDBField.php
index 802797f92..9418a6421 100644
--- a/core/model/fieldtypes/CompositeDBField.php
+++ b/core/model/fieldtypes/CompositeDBField.php
@@ -117,7 +117,9 @@ interface CompositeDBField {
 	 * 
 	 * @param DBField|array $value
 	 * @param array $record Map of values loaded from the database
-	 * @param boolean $markChanged
+	 * @param boolean $markChanged Indicate wether this field should be marked changed. 
+	 *  Set to FALSE if you are initializing this field after construction, rather
+	 *  than setting a new value.
 	 */
 	function setValue($value, $record = null, $markChanged = true);