  Following the procedure described in Pol et al., we update the Galactic
double neutron star (DNS) merger rate by including the new, highly eccentric
DNS system J0509+3801 (Lynch et al.). This leads to a new Galactic DNS merger
rate of $\mathcal{R}_{\rm MW} = 37^{+24}_{-11}$ Myr$^{-1}$, where the errors
represent 90% confidence intervals. The corresponding DNS merger detection rate
for Advanced LIGO is $\mathcal{R} = 1.9^{+1.2}_{-0.6} \times \left( D_{\rm r} /
100 \ \rm Mpc \right)^3 \rm yr^{-1},$ where $D_{\rm r}$ is the range distance.
Using the LIGO O3 range distance of 130 Mpc (Abbott et al.), we predict that
LIGO will detect anywhere between three and seven DNS mergers per year of
observing at O3 sensitivity.
