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-rw-r--r--usr.bin/comm/comm.16
1 files changed, 6 insertions, 0 deletions
diff --git a/usr.bin/comm/comm.1 b/usr.bin/comm/comm.1
index c054428..fb1a11e 100644
--- a/usr.bin/comm/comm.1
+++ b/usr.bin/comm/comm.1
@@ -107,6 +107,12 @@ The
.Nm
utility conforms to
.St -p1003.2-92 .
+.Pp
+The
+.Fl i
+option is an extension to the
+.Tn POSIX
+standard.
.Sh HISTORY
A
.Nm
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