content: add disclaimers to context example packages
Change-Id: I22fb0964e794cb98be572ef2d48a2c995652f6b0
Reviewed-on: https://go-review.googlesource.com/22781
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/content/context/google/google.go b/content/context/google/google.go
index 73778a3..740e6c5 100644
--- a/content/context/google/google.go
+++ b/content/context/google/google.go
@@ -1,5 +1,11 @@
// Package google provides a function to do Google searches using the Google Web
// Search API. See https://developers.google.com/web-search/docs/
+//
+// This package is an example to accompany https://blog.golang.org/context.
+// It is not intended for use by others.
+//
+// Google has since disabled its search API,
+// and so this package is no longer useful.
package google
import (
diff --git a/content/context/userip/userip.go b/content/context/userip/userip.go
index 4f316b5..49a7522 100644
--- a/content/context/userip/userip.go
+++ b/content/context/userip/userip.go
@@ -1,5 +1,8 @@
// Package userip provides functions for extracting a user IP address from a
// request and associating it with a Context.
+//
+// This package is an example to accompany https://blog.golang.org/context.
+// It is not intended for use by others.
package userip
import (
