diff --git a/doc/go1.5.txt b/doc/go1.5.txt
index 0167141608..5b93b0999b 100644
--- a/doc/go1.5.txt
+++ b/doc/go1.5.txt
@@ -49,6 +49,7 @@ text/template: add Options method (https://golang.org/cl/8462)
 Tools:
 
 build: external linking support for windows (https://golang.org/cl/7163, 7282, 7283, 7284, 7534, 7535)
+cmd/gc: constant arithmetic is based on math/big (https://golang.org/cl/7830, 7851, 7857, 8426, 7858, 7912, 8171)
 cmd/go, go/build: add ${SRCDIR} variable expansion to cgo lines (https://golang.org/cl/1756)
 cmd/go: add $DOLLAR to generate's variables (https://golang.org/cl/8091)
 cmd/go: std wildcard now excludes commands in main repo (https://golang.org/cl/5550)