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-rw-r--r--doc/ref/posix.texi3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/ref/posix.texi b/doc/ref/posix.texi
index b3a6a048f..56f5c78fc 100644
--- a/doc/ref/posix.texi
+++ b/doc/ref/posix.texi
@@ -470,6 +470,9 @@ line buffered
block buffered, using a newly allocated buffer of @var{size} bytes.
If @var{size} is omitted, a default size will be used.
@end defvar
+
+Only certain types of ports are supported, most importantly
+file ports.
@end deffn
@deffn {Scheme Procedure} fcntl port/fd cmd [value]