diff --git a/pdfpasswd/main.go b/pdfpasswd/main.go
index 53c8ef1..1f66bd4 100644
--- a/pdfpasswd/main.go
+++ b/pdfpasswd/main.go
@@ -4,7 +4,7 @@
 
 // Pdfpasswd searches for the password for an encrypted PDF
 // by trying all strings over a given alphabet up to a given length.
-package main
+package main // import "rsc.io/pdf/pdfpasswd"
 
 import (
 	"flag"