In our research article “High-power directional emission from microlasers with chaotic resonators” (C. Gmachl et al. , 5 June, p. [1556][1]) ([1][2]), the upper limit for the stability-range of the “bow-tie”-shaped resonance was incorrectly given as e ≈ 0.23 instead of e ≈ 0.18, which is the correct value within the flattened-quadrupole model of the resonator. The value of e ≈ 0.23 is correct for the simple quadrupole parameterized in polar coordinates as r (O) μ [1 + e · cos (2O)]. We thank Anthony E. Siegman of Stanford University for pointing out this error. Whether the bow-tie resonance has destabilized in the highest deformation lasers looked at experimentally (e ≈ 0.2) depends on the local curvature of the boundary at the locations of the bow-tie bounce-points, rather than on the global parameterization. Furthermore, because the bow-tie destabilizes only gradually, a strong effect on the experimental findings at high deformation is neither expected nor observed. 1. [↵][3]1. C. Gmachl 2. et al. , Science 1556 (1998). [1]: /lookup/doi/10.1126/science.280.5369.1556 [2]: #ref-1 [3]: #xref-ref-1-1 View reference 1 in text