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-rw-r--r--manual/llio.texi6
1 files changed, 4 insertions, 2 deletions
diff --git a/manual/llio.texi b/manual/llio.texi
index c196119956..259d11de96 100644
--- a/manual/llio.texi
+++ b/manual/llio.texi
@@ -935,7 +935,8 @@ random-access files, all append-type output streams are effectively
linked to each other.
@cindex cleaning up a stream
-If you have been using a stream for I/O, and you want to do I/O using
+If you have been using a stream for I/O (or have just opened the stream),
+and you want to do I/O using
another channel (either a stream or a descriptor) that is linked to it,
you must first @dfn{clean up} the stream that you have been using.
@xref{Cleaning Streams}.
@@ -1007,7 +1008,8 @@ You can skip the @code{fclean} or @code{fflush} if you know the stream
is already clean. A stream is clean whenever its buffer is empty. For
example, an unbuffered stream is always clean. An input stream that is
at end-of-file is clean. A line-buffered stream is clean when the last
-character output was a newline.
+character output was a newline. However, a just-opened input stream
+might not be clean, as its input buffer might not be empty.
There is one case in which cleaning a stream is impossible on most
systems. This is when the stream is doing input from a file that is not