diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index 9e03c7c..9ac877f 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -3727,7 +3727,7 @@ function! s:Blame(bang, line1, line2, count, mods, args) abort
     if empty(s:Relative('/'))
       call s:throw('file or blob required')
     endif
-    if filter(copy(a:args),'v:val !~# "^\\%(--first-parent\\|--root\\|--show-name\\|-\\=\\%([ltfnsew]\\|[MC]\\d*\\)\\+\\)$"') != []
+    if filter(copy(a:args),'v:val !~# "^\\%(--relative-date\\|--first-parent\\|--root\\|--show-name\\|-\\=\\%([ltfnsew]\\|[MC]\\d*\\)\\+\\)$"') != []
       call s:throw('unsupported option')
     endif
     call map(a:args,'s:sub(v:val,"^\\ze[^-]","-")')