Add additional index (fixes #521).
Add additional index (fixes #521).

aungzanbaw/rietveld,arg0/rietveld,arg0/rietveld,dushmis/rietveld,rietveld-codereview/rietveld,supriyantomaftuh/rietveld,arg0/rietveld,supriyantomaftuh/rietveld,dushmis/rietveld,rietveld-codereview/rietveld,rietveld-codereview/rietveld,supriyantomaftuh/rietveld,rietveld-codereview/rietveld,dushmis/rietveld,aungzanbaw/rietveld,aungzanbaw/rietveld