README: troubleshooting scenario and homebrew unsupported note

README.markdown

@@ -14,11 +14,13 @@ Note: `nvm` does not support [Fish] either (see [#303](https://github.com/creati
 
 Note: We still have some problems with FreeBSD, because there is no pre-built binary from official for FreeBSD, and building from source may need [patches](https://www.freshports.org/www/node/files/patch-deps_v8_src_base_platform_platform-posix.cc), see the issue ticket:
  - [[#900] [Bug] nodejs on FreeBSD need to be patched ](https://github.com/creationix/nvm/issues/900)
- - [nodejs/node#3716](https://github.com/nodejs/node/issues/3716)  
+ - [nodejs/node#3716](https://github.com/nodejs/node/issues/3716)
 
-Note: On OSX, if you do not have XCode installed and you do not wish to download the ~4.3GB file, you can install the `Command Line Tools`. You can check out this blog post on how to just that:  
+Note: On OSX, if you do not have XCode installed and you do not wish to download the ~4.3GB file, you can install the `Command Line Tools`. You can check out this blog post on how to just that:
  - [How to Install Command Line Tools in OS X Mavericks & Yosemite (Without Xcode)](http://osxdaily.com/2014/02/12/install-command-line-tools-mac-os-x/)
 
+Homebrew installation is not supported.
+
 ### Install script
 
 To install or update nvm, you can use the [install script][2] using cURL:
@@ -249,6 +251,8 @@ After the v0.8.6 release of node, nvm tries to install from binary packages. But
 
     nvm install -s 0.8.6
 
+If setting the `default` alias does not establish the node version in new shells (i.e. `nvm current` yields `system`), ensure that the system's node PATH is set before the `nvm.sh` source line in your shell profile (see [#658](https://github.com/creationix/nvm/issues/658))
+
 [1]: https://github.com/creationix/nvm.git
 [2]: https://github.com/creationix/nvm/blob/v0.29.0/install.sh
 [3]: https://travis-ci.org/creationix/nvm