Update README.md

Working towards #25

yaml.novaextension/README.md

@@ -13,6 +13,8 @@ Yaml Extension requires some additional tools to be installed on your Mac:
 
 > To install the current stable version of Node, click the "Recommended for Most Users" button to begin the download. When that completes, double-click the **.pkg** installer to begin installation.
 
+**Node version managers** — If you use something like [nvm](https://github.com/nvm-sh/nvm) or [fnm](https://github.com/Schniz/fnm), make sure it is configured inside your profile file (`.zprofile` or `.bash_profile`) instead of your rc file (`.zshrc` or `.bashrc`). See [Environment Variables](https://help.panic.com/nova/environment-variables/) for more.
+
 ## Usage
 
 Yaml Extension runs any time you open a local project with YAML files in it,