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-rw-r--r--usr.bin/diff/diff.19
1 files changed, 9 insertions, 0 deletions
diff --git a/usr.bin/diff/diff.1 b/usr.bin/diff/diff.1
index 6351c58114e0..29ee32cb8d2b 100644
--- a/usr.bin/diff/diff.1
+++ b/usr.bin/diff/diff.1
@@ -748,3 +748,12 @@ A
.Nm
command appeared in
.At v6 .
+The
+.Nm
+implimentation in
+.Fx 1.0
+until
+.Fx 11.4
+was GNU diff. This was replaced in
+.Fx 12.0
+by a BSD licensed diff implimentation. Some GNU'isms were lost in process.