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-rw-r--r--doc/coreutils.texi3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index cd1a0d25e..c35ae9140 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -2552,7 +2552,8 @@ Always print file name headers.
For compatibility @command{tail} also supports an obsolete usage
@samp{tail -@var{count}[bcl][f] [@var{file}]}, which is recognized
only if it does not conflict with the usage described
-above. @var{count} is an optional decimal number optionally
+above. This obsolete form uses exactly one option and at most one
+file. In the option, @var{count} is an optional decimal number optionally
followed by a size letter (@samp{b}, @samp{c}, @samp{l}) to mean count
by 512-byte blocks, bytes, or lines, optionally followed by @samp{f}
which has the same meaning as @option{-f}.