diff --git a/acme/dns_challenge.go b/acme/dns_challenge.go
new file mode 100644
index 000000000..e69de29bb
diff --git a/acme/pop_challenge.go b/acme/pop_challenge.go
new file mode 100644
index 000000000..8d2a213b0
--- /dev/null
+++ b/acme/pop_challenge.go
@@ -0,0 +1 @@
+package acme