Addendum for

    Index theory and quaternionic K\"ahler manifolds
    by S. Salamon

received on 16 February 1996 from the author

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Proofs of Theorems 4.1 and 5.4 are now published in

[] C. LeBrun, S. Salamon: Strong rigidity of positive quaternion-K\"ahler
   manifolds, Invent. Math. 118 (1994), 109--132.

Further interpretations of the results of Section 5 will appear in

[] K. Galicki, S. Salamon: Betti numbers of 3-Sasakian manifolds,
   Geom. Dedicata.

Some analogous results for hyper-K\"ahler manifolds can be found in

[] S.M. Salamon: On the cohomology of K\"ahler and hyper-K\"ahler
   manifolds, Topology 35 (1996), 137--155.