diff --git a/prepare.sh b/prepare.sh
index 5af9f5a..3de392b 100755
--- a/prepare.sh
+++ b/prepare.sh
@@ -1,5 +1,6 @@
 #!/usr/bin/env sh
 
+# baerer is the `authority` as in RFC 3986, here login for doku.ccc.de
 # recv data
 test -e baerer && auth=$(head -1 baerer) || {
 	echo "error: authentication information not found."