diff --git a/api/except.txt b/api/except.txt
index ccfdf06c55..79ffd91da0 100644
--- a/api/except.txt
+++ b/api/except.txt
@@ -1,4 +1,5 @@
 pkg encoding/json, method (*RawMessage) MarshalJSON() ([]uint8, error)
+pkg go/types, type Type interface { String, Underlying }
 pkg math/big, const MaxBase = 36
 pkg math/big, type Word uintptr
 pkg net, func ListenUnixgram(string, *UnixAddr) (*UDPConn, error)