diff --git a/backend/local/doc.go b/backend/local/doc.go
new file mode 100644
index 000000000..a2b160c4c
--- /dev/null
+++ b/backend/local/doc.go
@@ -0,0 +1,2 @@
+// Package local implements repository storage in a local directory.
+package local
diff --git a/backend/sftp/doc.go b/backend/sftp/doc.go
new file mode 100644
index 000000000..cd4a3a99b
--- /dev/null
+++ b/backend/sftp/doc.go
@@ -0,0 +1,3 @@
+// Package sftp implements repository storage in a directory on a remote server
+// via the sftp protocol.
+package sftp