+* Files removed during incremental dumps
+
+If a file or directory is removed while incremental dump is
+in progress, tar exact actions depend on whether this file
+was explicitly listed in the command line, or was gathered
+during file system scan.
+
+If the file was explicitly listed in the command line, tar
+issues error message and exits with the code 2, meaning
+fatal error.
+
+Otherwise, if the file was gathered during the file system
+scan, tar issues a warning, saying "File removed before we read it",
+and sets the exit code to 1, which means "some files differ".
+If the --warning=no-file-removed option is given, no warning
+is issued and the exit code remains 0.
+
+* Modification times of PAX extended headers.
+
+Modification times in the ustar header blocks for the
+extended headers are set to the mtimes of the corresponding archive
+members. This can be overridden by the
+
+ --pax-opion='exthdr.mtime=STRING'
+
+command line option. The STRING is either the number of seconds since
+the Epoch or a `Time reference' (see below).
+
+Modification times in the ustar header blocks for the global
+extended headers are set to the time when tar was invoked.
+
+This can be overridden by the
+
+ --pax-opion='globexthdr.mtime=STRING'
+
+command line option. The STRING is either the number of seconds since
+the Epoch or a `Time reference' (see below).
+
+* Time references in --pax-option argument.
+
+Any value from the --pax-option argument that is enclosed in a pair
+of curly braces represents a time reference. The string between the
+braces is understood either as a textual time representation, as described in
+chapter 7, "Date input formats", of the Tar manual, or as a name of
+an existing file, starting with `/' or `.'. In the latter
+case, the value is replaced with the modification time of that file.
+