[chef] Adding a recipe to an existing role in chef-server

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My chef client node has an "app" role in it's run_list, that has already run 
on
my node. Let's say it that the app role has two recipes in it's run_list:
"nginx" and "varnish". I update my my app role on my chef server, so that it
now has three recipes: "nginx", "varnish", and "git". When I run `sudo
chef-client` on my node, it doesn't pick up on the fact that the app role has
changed, and run the new "git" recipe...has anyone else has this problem? Is
this by design or am I doing something wrong?