gob: clarify the comments about installing the debug/dumper.

R=rsc
CC=golang-dev
https://golang.org/cl/2789043
diff --git a/src/pkg/gob/debug.go b/src/pkg/gob/debug.go
index 72645bd..cbd662d 100644
--- a/src/pkg/gob/debug.go
+++ b/src/pkg/gob/debug.go
@@ -1,6 +1,7 @@
 package gob
 
 // This file is not normally included in the gob package.  Used only for debugging the package itself.
+// Add debug.go to the files listed in the Makefile to add Debug to the gob package.
 
 import (
 	"bytes"
@@ -14,7 +15,7 @@
 var dump = false // If true, print the remaining bytes in the input buffer at each item.
 
 // Init installs the debugging facility. If this file is not compiled in the
-// package, Debug will be a no-op.
+// package, the test in codec_test.go is a no-op.
 func init() {
 	debugFunc = Debug
 }