diff --git a/metainfo/info.go b/metainfo/info.go
index 462288d3..7fbc88e9 100644
--- a/metainfo/info.go
+++ b/metainfo/info.go
@@ -14,13 +14,14 @@ import (
 
 // The info dictionary.
 type Info struct {
-	PieceLength int64      `bencode:"piece length"`
-	Pieces      []byte     `bencode:"pieces"`
-	Name        string     `bencode:"name"`
-	Length      int64      `bencode:"length,omitempty"`
-	Private     *bool      `bencode:"private,omitempty"`
-	Source      string     `bencode:"source,omitempty"`
-	Files       []FileInfo `bencode:"files,omitempty"`
+	PieceLength int64  `bencode:"piece length"`
+	Pieces      []byte `bencode:"pieces"`
+	Name        string `bencode:"name"`
+	Length      int64  `bencode:"length,omitempty"`
+	Private     *bool  `bencode:"private,omitempty"`
+	// TODO: Document this field.
+	Source string     `bencode:"source,omitempty"`
+	Files  []FileInfo `bencode:"files,omitempty"`
 }
 
 // This is a helper that sets Files and Pieces from a root path and its