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-rw-r--r--doc/ref/api-io.texi4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/ref/api-io.texi b/doc/ref/api-io.texi
index f1170eb2c..02d92a2d7 100644
--- a/doc/ref/api-io.texi
+++ b/doc/ref/api-io.texi
@@ -1816,6 +1816,10 @@ indicating the position of the next byte is to read.
Finally, if @var{close} is not @code{#f}, it must be a thunk. It is
invoked when the custom binary input port is closed.
+The returned port is fully buffered by default, but its buffering mode
+can be changed using @code{setvbuf} (@pxref{Ports and File Descriptors,
+@code{setvbuf}}).
+
Using a custom binary input port, the @code{open-bytevector-input-port}
procedure could be implemented as follows: