diff --git a/doc/go1.5.txt b/doc/go1.5.txt
index 8e0a0f26bc..524c584a7b 100644
--- a/doc/go1.5.txt
+++ b/doc/go1.5.txt
@@ -43,6 +43,7 @@ flag: new nicer format for PrintDefaults (https://golang.org/cl/7330)
 fmt: empty slices now print nothing with %x (bug fix) (https://golang.org/cl/8864)
 fmt: reflect.Value now prints what it holds (https://golang.org/cl/8731)
 go/ast: add Implicit field to ast.EmptyStmt; changed meaning of ast.EmptyStmt.Semicolon position (https://golang.org/cl/5720)
+go/build: reserved GOARCHes for common architectures (https://golang.org/cl/9644)
 io: add CopyBuffer, Copy with user-provided buffer (https://golang.org/cl/8730)
 log: add SetOutput functions (https://golang.org/cl/2686, https://golang.org/cl/3023)
 log: add LUTC flag (https://golang.org/cl/8761)