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-rw-r--r--Doc/lib/libos.tex1
1 files changed, 1 insertions, 0 deletions
diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index 8388d3f..6dd733d 100644
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -228,6 +228,7 @@ These functions create new file objects.
\begin{funcdesc}{fdopen}{fd\optional{, mode\optional{, bufsize}}}
Return an open file object connected to the file descriptor \var{fd}.
+\index{I/O control!buffering}
The \var{mode} and \var{bufsize} arguments have the same meaning as
the corresponding arguments to the built-in \function{open()}
function.