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-rw-r--r--Doc/lib/libos.tex2
1 files changed, 1 insertions, 1 deletions
diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index 0d23bd7..7611e5b 100644
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -763,7 +763,7 @@ Availability: Macintosh, \UNIX, Windows.
\begin{funcdesc}{chown}{path, uid, gid}
Change the owner and group id of \var{path} to the numeric \var{uid}
-and \var{gid}.
+and \var{gid}. To leave one of the ids unchanged, set it to -1.
Availability: Macintosh, \UNIX.
\end{funcdesc}