diff --git a/modules/people/README.md b/modules/people/README.md
index d3e2e76..4afcedf 100644
--- a/modules/people/README.md
+++ b/modules/people/README.md
@@ -19,6 +19,8 @@ class people::jbarnette {
 }
 ```
 
+Note that if your GitHub username contains dashes, you should replace them by underscores in both the manifest name and the class name.
+
 ## Projects
 
 While you _can_ include projects one by one, sometimes you might just want
diff --git a/script/boxen-my-config b/script/boxen-my-config
index cfe20d8..bc51f79 100755
--- a/script/boxen-my-config
+++ b/script/boxen-my-config
@@ -9,7 +9,7 @@ end
 
 editor = ENV["VISUAL"] || ENV["EDITOR"]
 home   = ENV["BOXEN_HOME"] + "/repo"
-user   = user.downcase
+user   = user.downcase.tr('-', '_')
 path   = "#{home}/modules/people/manifests/#{user}.pp"
 
 unless File.exist? path