diff --git a/msgauth.go b/msgauth.go
new file mode 100644
index 0000000..d07775e
--- /dev/null
+++ b/msgauth.go
@@ -0,0 +1,4 @@
+// Package msgauth parses and formats Authentication-Results
+//
+// Authentication-Results header fields are standardized in RFC 7601.
+package msgauth