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-rw-r--r--manual/stdio.texi3
1 files changed, 2 insertions, 1 deletions
diff --git a/manual/stdio.texi b/manual/stdio.texi
index 6610ae5105..0f82864af3 100644
--- a/manual/stdio.texi
+++ b/manual/stdio.texi
@@ -3901,7 +3901,8 @@ make_message_string (const char *a, int b)
This section describes how you can make a stream that gets input from an
arbitrary data source or writes output to an arbitrary data sink
-programmed by you. We call these @dfn{custom streams}.
+programmed by you. We call these @dfn{custom streams}. The functions
+and types described here are all GNU extensions.
@c !!! this does not talk at all about the higher-level hooks