diff --git a/README.md b/README.md
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+++ b/README.md
@@ -2,3 +2,7 @@
 =========
 
 The dotfiles I use. Includes configuration files for vim, bash, ghci and git.
+
+Some of the configurations are OS X-centric(most notably `update()` in 
+`bash_profile`, which updates both MacPorts and Homebrew, OS X's package
+managers).