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diff --git a/man/man3/quaternion.3 b/man/man3/quaternion.3
index 941df245..224baea7 100644
--- a/man/man3/quaternion.3
+++ b/man/man3/quaternion.3
@@ -150,3 +150,10 @@ This is just a rotation about the same axis by half the angle.
.SH SEE ALSO
.IR matrix (3),
.IR qball (3)
+.SH BUGS
+To avoid name conflicts with NetBSD,
+.I qdiv
+is a preprocessor macro defined as
+.IR p9qdiv ;
+see
+.IR intro (3).