diff --git a/src/pkg/go/doc/reader.go b/src/pkg/go/doc/reader.go
index 3c30d1a07b..31648b13e1 100644
--- a/src/pkg/go/doc/reader.go
+++ b/src/pkg/go/doc/reader.go
@@ -488,6 +488,7 @@ var predeclaredTypes = map[string]bool{
 	"byte":       true,
 	"complex64":  true,
 	"complex128": true,
+	"error":      true,
 	"float32":    true,
 	"float64":    true,
 	"int":        true,
@@ -495,6 +496,7 @@ var predeclaredTypes = map[string]bool{
 	"int16":      true,
 	"int32":      true,
 	"int64":      true,
+	"rune":       true,
 	"string":     true,
 	"uint":       true,
 	"uint8":      true,