diff --git a/README.md b/README.md
index b884a0a..f01c287 100644
--- a/README.md
+++ b/README.md
@@ -173,17 +173,13 @@ Set the mode of the combined file.
 
 #####`warn`
 Determine if a warning message should be added at the top of the file to let
-users know it was autogenerated by Puppet.
+users know it was autogenerated by Puppet.  It should be a boolean or a string
+containing the contents of the warning message.
 
 ######Example
 - warn => true
 - warn => false
-
-#####`warn_message`
-Set the contents of the warning message.
-
-######Example
-- warn_message => 'This file is autogenerated!'
+- warn => '# This file is autogenerated!'
 
 #####`force`
 Determine if empty files are allowed when no fragments were added.