-With the option:--all option, *all* the tracing sessions, as listed in
-the output of `lttng list` (see man:lttng-list(1)), are cleared.
+With the 'SESSION' argument::
+ The existing tracing session named 'SESSION'.
+
+With the option:--all option::
+ *All* the tracing sessions of your Unix user, as listed in the
+ output of `lttng list` (see man:lttng-list(1)).