diff --git a/src/net/net.go b/src/net/net.go
index c850d2b..339c972 100644
--- a/src/net/net.go
+++ b/src/net/net.go
@@ -135,6 +135,8 @@
 }
 
 // LocalAddr returns the local network address.
+// The Addr returned is shared by all invocations of LocalAddr, so
+// do not modify it.
 func (c *conn) LocalAddr() Addr {
 	if !c.ok() {
 		return nil
@@ -143,6 +145,8 @@
 }
 
 // RemoteAddr returns the remote network address.
+// The Addr returned is shared by all invocations of RemoteAddr, so
+// do not modify it.
 func (c *conn) RemoteAddr() Addr {
 	if !c.ok() {
 		return nil