Design/Frames.md

@@ -41,6 +41,7 @@ Data is synchronised and organised into discrete frames that are represented by
 * **2.1.4** Frames are associated with a valid source identifier by `Feed`.
 * **2.1.5** `Frame` id and timestamp together are unique within the `Feed`.
 * **2.1.6** Timestamp at creation must be newer than any previously created or received.
+* **2.1.7** Multiple modifying frames can be created by non-owner for each `Frame` generated by the owner, these being combined as per storage mode.
 
 #### 2.2 General Modification Rules
 * **2.2.1** A `Frame` can be modified only prior to flushing (aka. transmission).