+.BR datalocking :
+fcntl
+.RS 5
+The locking algorithm used to lock changes to any
+.B nmh
+data files, such as sequences or the context. The locking algorithm is
+any one of the following entries:
+.PP
+.RS 5
+.nf
+%supported_locks%
+.fi
+.RE
+.PP
+Available locking algorithms can vary depending on what is supported by
+the operating system. Note: currently transactional locking is only
+supported on public sequences; see
+.IR mh\-sequence (5)
+for more information.
+(profile, default: fcntl)
+.RE
+.PP