-.TP
-.BI changelog_register " [-n]"
-Register a new changelog user for a particular device. Changelog entries
-will not be purged beyond any registered users' set point. (See lfs changelog_clear.)
-.br
-.B -n
-Print only the ID of the newly registered user.
-.TP
-.BI changelog_deregister " <id>"
-Unregister an existing changelog user. If the user's "clear" record number
-is the minimum for the device, changelog records will be purged until the
-next minimum.
+Changelog user can be registered and deregistered on particular device.
+Changelog starts logging when any user is registered.
+
+For more details see:
+
+.PP
+\fBlctl-changelog_register\fR(8)
+.RS 4
+Register a new changelog user on specified MDT device with specified parameters.
+.RE
+.PP
+\fBlctl-changelog_deregister\fR(8)
+.RS 4
+Deregister an existing changelog user on the specified MDT.
+