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-rw-r--r--lib/libc/sys/lseek.24
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/libc/sys/lseek.2 b/lib/libc/sys/lseek.2
index 9a4f2b89753..f32bc5490b7 100644
--- a/lib/libc/sys/lseek.2
+++ b/lib/libc/sys/lseek.2
@@ -120,7 +120,9 @@ is not an open file descriptor.
is associated with a pipe, socket, or FIFO.
.It Bq Er EINVAL
.Fa Whence
-is not a proper value or the resulting offset would be negative.
+is not a proper value or the resulting offset would be negative
+on a file system or special device that does not allow negative
+offsets to be used.
.El
.Sh SEE ALSO
.Xr dup 2 ,