diff --git a/README.md b/README.md
index 0ac48e3..b2b6ffd 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,7 @@ and detect most of these and tell you anyway):
 
 * Boxen __requires__ at least the Xcode Command Line Tools installed.
 * Boxen __will not__ work with an existing rvm install.
+* Boxen __may not__ play nice with a GitHub username that includes dash(-)
 * Boxen __may not__ play nice with an existing rbenv install.
 * Boxen __may not__ play nice with an existing chruby install.
 * Boxen __may not__ play nice with an existing homebrew install.