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-rw-r--r--doc/coreutils.texi5
1 files changed, 4 insertions, 1 deletions
diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index b7ccf3849..d2377f41b 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -2852,7 +2852,10 @@ changed size.
Historical implementations of @command{tail} have required that
@var{number} be an integer. However, GNU @command{tail} accepts
an arbitrary floating point number. @xref{Floating point}.
-When @command{tail} uses inotify, this polling-related option is ignored.
+When @command{tail} uses inotify, this polling-related option
+is usually ignored. However, if you also specify @option{--pid=@var{p}},
+@command{tail} checks whether process @var{p} is alive at least
+every @var{number} seconds.
@itemx --pid=@var{pid}
@opindex --pid