diff --git a/src/sync/atomic/doc.go b/src/sync/atomic/doc.go
index 7c007d7a15..108b76b804 100644
--- a/src/sync/atomic/doc.go
+++ b/src/sync/atomic/doc.go
@@ -47,7 +47,8 @@ import (
 //
 // On non-Linux ARM, the 64-bit functions use instructions unavailable before the ARMv6k core.
 //
-// On both ARM and x86-32, it is the caller's responsibility to arrange for 64-bit
+// On ARM, x86-32, and 32-bit MIPS,
+// it is the caller's responsibility to arrange for 64-bit
 // alignment of 64-bit words accessed atomically. The first word in a
 // variable or in an allocated struct, array, or slice can be relied upon to be
 // 64-bit aligned.