Erratum for

**Reflection groups on the octave hyperbolic plane**

*J. Alg.* **213** (1999) 467-498

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Line 7 of p. 483 of the published version contains an error; this
is the sentence after the second displayed equation after (4.20). The
error is that identity (2.3) is used even though **xi** might not be
purely imaginary. Happily, (2.3) is not needed. The sentence may be
replaced by "Taking **xi z=y**, we find that
**x(xi z)=(x xi)z** for all octaves **x** and
**z**."

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