diff --git a/cmd/godoc/x.go b/cmd/godoc/x.go
index 3b1ee3c2..55fd646f 100644
--- a/cmd/godoc/x.go
+++ b/cmd/godoc/x.go
@@ -35,6 +35,7 @@ var xMap = map[string]xRepo{
 	"text":       {"https://code.google.com/p/go.text", "hg"},
 	"tools":      {"https://code.google.com/p/go.tools", "hg"},
 
+	"oauth2": {"https://go.googlesource.com/oauth2", "git"},
 	"review": {"https://go.googlesource.com/review", "git"},
 }