-Perform actions within the context of connection tracking. These actions
-are in the same format as the actions accepted as part of a flow, however
-there are additional restrictions applied. For instance, only actions which
-modify the ct fields are accepted within the \fBexec\fR action. Furthermore,
-some actions may only be performed in this context, for instance modifying the
-ct_mark field:
+Perform actions within the context of connection tracking. This is a restricted
+set of actions which are in the same format as their specifications as part
+of a flow. Only actions which modify the \fBct_mark\fR or \fBct_label\fR
+fields are accepted within the \fBexec\fR action, and these fields may only be
+modified with this option. For example: