diff --git a/src/net/net.go b/src/net/net.go
index ab6aeaac2f..77e54a9125 100644
--- a/src/net/net.go
+++ b/src/net/net.go
@@ -125,10 +125,10 @@ type Conn interface {
 	// Any blocked Read or Write operations will be unblocked and return errors.
 	Close() error
 
-	// LocalAddr returns the local network address.
+	// LocalAddr returns the local network address, if known.
 	LocalAddr() Addr
 
-	// RemoteAddr returns the remote network address.
+	// RemoteAddr returns the remote network address, if known.
 	RemoteAddr() Addr
 
 	// SetDeadline sets the read and write deadlines associated
@@ -328,7 +328,7 @@ type PacketConn interface {
 	// Any blocked ReadFrom or WriteTo operations will be unblocked and return errors.
 	Close() error
 
-	// LocalAddr returns the local network address.
+	// LocalAddr returns the local network address, if known.
 	LocalAddr() Addr
 
 	// SetDeadline sets the read and write deadlines associated