  The purpose of this erratum is to fill a gap in the proof of the `Composite
Braid Theorem' in the manuscript "Studying Links Via Closed Braids IV:
Composite Links and Split Links (SLVCB-IV)", Inventiones Math, \{bf 102\} Fasc.
1 (1990), 115-139. The statement of the theorem is unchanged. The gap occurs on
page 135, lines $13^-$ to $11^-$, where we fail to consider the case: $V_2 = 4,
V_4 > 0, V_j=0$ if $j not= 2,4,$ and all 4 vertices of valence 2 are bad.
  At the end of this Erratum we make some brief remarks on the literature, as
it has evolved during the 14 years between the publication of SLVCB-IV and the
submission of this Erratum.
