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-rw-r--r--doc/coreutils.texi6
1 files changed, 4 insertions, 2 deletions
diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index f0e46b9ee..7852e9f8a 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -3409,8 +3409,10 @@ are not split even if they overlap a partition, the files written
can be larger or smaller than the partition size, and even empty
if a line/record is so long as to completely overlap the partition.
-For @samp{r} mode, the size of @var{input} is irrelevant,
-and so can be a pipe for example.
+When the input is a pipe or some other special file where the size
+cannot easily be determined, there is no trouble for @samp{r} mode
+because the size of the input is irrelevant. For other modes, such an
+input is first copied to a temporary to determine its size.
@item -a @var{length}
@itemx --suffix-length=@var{length}