diff --git a/doc/go1.5.txt b/doc/go1.5.txt
index 0d52b9d4da..42c739b4a3 100644
--- a/doc/go1.5.txt
+++ b/doc/go1.5.txt
@@ -11,3 +11,5 @@ net/smtp: add TLSConnectionState accessor (https://golang.org/cl/2151)
 Performance:
 
 strconv: optimize decimal to string conversion (https://golang.org/cl/2105)
+math/big: faster assembly kernels for amd64 and 386 (https://golang.org/cl/2503, https://golang.org/cl/2560)
+math/big: faster "pure Go" kernels for platforms w/o assembly kernels (https://golang.org/cl/2480)