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-rw-r--r--doc/ref/api-io.texi3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/ref/api-io.texi b/doc/ref/api-io.texi
index 93bbca5ba..a0be2dd57 100644
--- a/doc/ref/api-io.texi
+++ b/doc/ref/api-io.texi
@@ -996,6 +996,9 @@ Also, open the file using the binary-compatible character encoding
@item +
Open the port for both input and output. E.g., @code{r+}: open
an existing file for both input and output.
+@item e
+Mark the underlying file descriptor as close-on-exec, as per the
+@code{O_CLOEXEC} flag.
@item 0
Create an "unbuffered" port. In this case input and output
operations are passed directly to the underlying port