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-rw-r--r--lib/kernel/doc/src/file.xml6
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/kernel/doc/src/file.xml b/lib/kernel/doc/src/file.xml
index b3e8149cc2..d923207f9f 100644
--- a/lib/kernel/doc/src/file.xml
+++ b/lib/kernel/doc/src/file.xml
@@ -1444,7 +1444,11 @@ f.txt: {person, "kalle", 25}.
break this module's atomicity guarantees as it can race with a
concurrent call to
<seealso marker="#write_file_info/2"><c>write_file_info/1,2</c>
- </seealso></p>
+ </seealso>.</p>
+ <p>This option has no effect when the function is
+ given an I/O device instead of a file name. Use
+ <seealso marker="#open/2"><c>open/2</c></seealso> with the
+ <c>raw</c> mode to obtain a file descriptor first.</p>
<note>
<p>As file times are stored in POSIX time on most OS, it is faster to
query file information with option <c>posix</c>.</p>