how add two checkboxs on MUI's finish page

I write these code:
"
!define MUI_WELCOMEPAGE
!define MUI_LICENSEPAGE
!define MUI_COMPONENTSPAGE
!define MUI_DIRECTORYPAGE
!define MUI_FINISHPAGE
!define MUI_FINISHPAGE_RUN "$INSTDIR\modern.exe"
......
"
But I only have one checkbox ! If I want to have two checkboxs,how do I do?

The second checkbox is for a readme. See MUI_FINISHPAGE_SHOWREADME in the MUI readme.