-For a given tracing session, if at least one rotation occurred (see
-man:lttng-rotate(1)), only its tracing buffers and its current trace
-chunk are cleared; its archived trace chunks are :not: cleared.
+With the option:--all option::
+ *All* the recording sessions of the connected session daemon for
+ your Unix user, or for all users if your Unix user is `root`, as
+ listed in the output of `lttng list` (see man:lttng-list(1)).
++
+See the ``Session daemon connection'' section of man:lttng(1) to learn
+how a user application connects to a session daemon.
+
+If a recording session is configured in snapshot mode (see the
+nloption:--snapshot option of the man:lttng-create(1) command), the
+`clear` command only clears the recording buffers.
+
+For a given recording session, if at least one rotation occurred (see
+man:lttng-concepts(7)), the `clear` command only clears its recording
+buffers and its current trace chunk, :not: its archived trace chunks.