diff --git a/ext/gpgme/extconf.rb b/ext/gpgme/extconf.rb
index 88b93f0..c0cea4f 100644
--- a/ext/gpgme/extconf.rb
+++ b/ext/gpgme/extconf.rb
@@ -2,8 +2,8 @@
 
 # Available options:
 #
-# --enable-clean
-# --disable-clean (default)
+# --enable-clean (default)
+# --disable-clean
 #
 # This file is largely based on Nokogiri's extconf.rb.