commit 35b3a91ed720ad89b888fd5f7a717a69beaaaa58
from: Omar Polo <op@omarpolo.com>
date: Sat Dec 05 11:36:57 2020 UTC

correct also the other example

push can add duplicate elements, and that’s not what we want as an
example.

commit - 30dcedecffad644f77c4de56ad8817cd6ab02c03
commit + 35b3a91ed720ad89b888fd5f7a717a69beaaaa58
blob - 3f6256317a105e676fed55b1b1cc9b06b8230fb6
blob + d2dbdb840e3005ab1e6282a2eccf6824fd8510e4
--- README.md
+++ README.md
@@ -12,7 +12,7 @@ make sure that `vc-got` is within your `load-path`.  Y
 require the library.
 
 ```emacs-lisp
-(push 'Got vc-handled-backends)
+(cl-pushnew 'Got vc-handled-backends)
 ```
 
 With `use-package` something like this should be enough: